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Dr.Napester
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| A dot plot is an easy way to represent the relationship between two variables.((FALSE)) |
| A dot plot is useful for quickly graphing frequencies in a small data set.((TRUE)) |
| A dot plot shows the symmetry of a distribution.((TRUE)) |
| A dot plot is useful for showing individual observations.((TRUE)) |
| A dot plot is useful for showing the range of the data.((TRUE)) |
| Quartiles divide a distribution into four equal parts.((TRUE)) |
| Quartiles divide a distribution into 10 equal parts.((FALSE)) |
| Percentiles divide a distribution into 100 equal parts.((TRUE)) |
| A student scored in the 85th percentile on a standardized test. This means that the student scored lower than 85% of all students who took the test.((FALSE)) |
| The 50th percentile of a distribution is the same as the distribution mean.((FALSE)) |
| A box plot graphically shows the 10th and 90th percentiles.((FALSE)) |
| The "box" in a box plot shows the interquartile range.((TRUE)) |
| A box plot shows the skewness of a distribution.((TRUE)) |
| The coefficient of skewness is the standard deviation divided by the mean.((FALSE)) |
| Pearson's coefficient of skewness is a measure of a distribution's symmetry.((TRUE)) |
| If a distribution is negatively skewed, the distribution is not symmetrical and the long tail is to the left.((TRUE)) |
| A scatter diagram of sales versus production is labeled with sales on the Y-axis and production on the X-axis.((TRUE)) |
| A scatter diagram of sales versus production may be constructed by plotting the minimum, first quartile, median, third quartile, and maximum values of each variable.((FALSE)) |
| A scatter diagram is used to illustrate a relationship between gender and the preference for Coke or Pepsi.((FALSE)) |
| A relationship between two nominal variables is summarized by a contingency table.((TRUE)) |
| A stem-and-leaf diagram shows the actual data values.((TRUE)) |
| In a stem-and-leaf display, the leaf represents a class of a frequency distribution.((FALSE)) |
| In a stem-and-leaf display, the leaf represents the members of a class in a frequency distribution.((TRUE)) |
| A dot plot shows ________.((the general shape of a distribution)) |
| A dot plot is best applied when ________.((a single variable is summarized)) |
| A dot plot is best applied for a data set with ________.((50 observations)) |
| A dot plot can be used to show ________.((the distribution for a quantitative variable)) |
| The following graph is a ________.((Dot plot)) |
| The test scores for a class of 147 students are computed. What is the location of the test score associated with the third quartile?((111)) |
| Quartiles divide a distribution into ________.((4 equal parts)) |
| In a distribution, the second quartile corresponds with the ________.((median)) |
| Percentiles divide a distribution into ________.((100 equal parts)) |
| To locate the percentile for a given observation in a data set, the data must be ________.((sorted and listed from the minimum to the maximum values)) |
| If a student places in the 99th percentile on an exam, she performed better than 99% of all students who completed the exam. Her performance is similar to a statement based on a ________.((cumulative frequency distribution)) |
| In the following set of data: (1, 3, 5, 6, 7, 9, 100), what are the first, second, and third quartiles?((3, 6, and 9)) |
| The following graph is a ________.((box plot)) |
| What statistics are needed to draw a box plot?((The minimum, maximum, median, first and third quartiles)) |
| A box plot shows ________.((the relative symmetry of a distribution for a set of data)) |
| What does the interquartile range describe?((The range of the middle 50% of the observations)) |
| The interquartile range is graphically presented in a ________.((box plot)) |
| Outliers are clearly presented in a ________.((box plot)) |
| Using the following statistics to describe a distribution of data, what is the interquartile range? Minimum = 10 Q1 = 25 Median = 50 Q3 = 75 Maximum = 95 ((50)) |
| If the coefficient of skewness is equal to zero, the shape of the distribution is ________.((symmetric)) |
| The range of the coefficient of skewness is ________.((both positive and negative values)) |
| The following graph is ________.((positively skewed)) |
| A large oil company is studying the number of gallons of gasoline purchased per customer at self-service pumps. The mean number of gallons is 10.0, with a standard deviation of 3.0 gallons. The median is 10.75 gallons. What is Pearson's coefficient of skewness in this instance?((−0.75)) |
| What is the value of the Pearson coefficient of skewness for a distribution with a mean of 17, a median of 12, and a standard deviation of 6?((+2.5)) |
| What is the possible range of values for Pearson's coefficient of skewness?((−3 and +3)) |
| A sample of experienced typists revealed that their mean typing speed is 87 words per minute and the median typing speed is 73 words per minute. The standard deviation of typing speed is 16.9 words per minute. What is the Pearson coefficient of skewness?((+2.5)) |
| The following graph is a ________.((scatter diagram)) |
| The following graph illustrates ________.((a positive or direct relationship)) |
| In a scatter diagram, we describe the relationship between ________.((two variables measured at the interval or ratio level)) |
| In a contingency table, we describe the relationship between ________.((two variables measured at the ordinal or nominal level)) |
| A contingency table would be used to summarize data such as ________.((company employees by gender and organizational title)) |
| A stem-and-leaf display includes the following row: 3 | 0 1 3 5 7 9. Assume that the data are rounded to the nearest whole number. Which of the following statements is true?((The maximum value in the class is 39.)) |
| The following table is a ________.((stem-and-leaf display)) |
| A stem-and-leaf display includes the following row: 5 | 10 11 31 52 79 98. Assume that the data are rounded to the nearest whole number.((The class interval is 100.)) |
| In the following table,((the range is 33.)) |
| In the following table,((there are 4 observations in the second class.)) |
| The median of a sample will always equal the ________.((50th percentile)) |
| The 75th percentile is referred to as the ________.((third quartile)) |
| The 67th percentile is ________.((the value below which 67% of the observations occur)) |
| The eighth decile ________.((is the same as the 80th percentile)) |
| Which of the following is NOT a measure of dispersion?((The 50th percentile)) |
| A population is a collection of all individuals, objects, or measurements of interest.((TRUE)) |
| Statistics are used as a basis for making decisions.((TRUE)) |
| A listing of 100 family annual incomes is an example of statistics.((FALSE)) |
| The average number of passengers on commercial flights between Chicago and New York City is an example of a statistic.((TRUE)) |
| Statistics is used to report the summary results of market surveys.((TRUE)) |
| A sample is a portion or part of the population of interest.((TRUE)) |
| To infer something about a population, we usually take a sample from the population.((TRUE)) |
| Descriptive statistics are used to find out something about a population based on a sample.((FALSE)) |
| There are four levels of measurement: qualitative, quantitative, discrete, and continuous.((FALSE)) |
| The ordinal level of measurement is considered the "lowest" level of measurement.((FALSE)) |
| A store asks shoppers for their zip codes to identify market areas. Zip codes are an example of ratio data.((FALSE)) |
| An ordinal level of measurement implies some sort of ranking.((TRUE)) |
| Data measured on a nominal scale can only be classified into categories.((TRUE)) |
| The terms descriptive statistics and inferential statistics can be used interchangeably.((FALSE)) |
| A marketing research agency was hired to test a new DVD player. Consumers rated it outstanding, very good, fair, or poor. The level of measurement for this experiment is ordinal.((TRUE)) |
| The Union of Electrical Workers of America with 9,128 members polled 362 members about a new wage package that will be submitted to management. The population is the 362 members.((FALSE)) |
| The CIA World Factbook cited these numbers for the United States: • The birthrate is 13.66 births per 1,000 of the population. • The average life expectancy for females is 81.17 years. • Approximately 316.7 million persons reside in the United States. Each of these numbers is referred to as a statistic. ((TRUE)) |
| If we select 100 persons from 25,000 registered voters and question them about candidates and issues, the 100 persons are referred to as the population.((FALSE)) |
| Statistics is defined as a body of techniques used to facilitate the collection, organization, presentation, analysis, and interpretation of information for the purpose of making better decisions.((TRUE)) |
| Categorizing voters as Democrats, Republicans, and Independents is an example of interval level measurement.((FALSE)) |
| The order in which runners finish in a race would be an example of continuous data.((FALSE)) |
| Based on a sample of 3,000 people, the civilian unemployment rate in the United States was 5.5%. 5.5% is referred to as a statistic.((TRUE)) |
| The principal difference between the interval and ratio scale is that the ratio scale has a meaningful zero point.((TRUE)) |
| The branch of mathematics used to facilitate the collection, organization, presentation, analysis, and interpretation of numerical information is referred to as statistics.((TRUE)) |
| The number of children in a family is a discrete variable.((TRUE)) |
| The main purpose of descriptive statistics is to((summarize data in a useful and informative manner.)) |
| Which of the following is an example of a continuous variable?((Tons of concrete to complete a parking garage)) |
| The incomes of 50 loan applicants are obtained. Which level of measurement is income?((Ratio)) |
| When TV advertisements report that "2 out of 3 dentists surveyed indicated they would recommend Brand X toothpaste to their patients," an informed consumer may question the conclusion because((the advertisement does not include the total number of dentists surveyed.)) |
| A bank asks customers to evaluate its drive-through service as good, average, or poor. Which level of measurement is this classification?((Ordinal)) |
| A portion or part of a population is called a((sample.)) |
| If Gallup, Harris, and other pollsters asked people to indicate their political party affiliations as Democrat, Republican, or independent, the data gathered would be an example of which scale of measurement?((Nominal)) |
| The members of each basketball team wear numbers on their jerseys. What scale of measurement are these numbers considered?((Nominal)) |
| A marketing class of 50 students evaluated the instructor using the following scale: superior, good, average, poor, or inferior. The descriptive summary showed the following survey results: 2% superior, 8% good, 45% average, 45% poor, and 0% inferior.((Most students rated the instructor as poor or average.)) |
| A survey includes a question about marital status that has the following responses: single, married, divorced, separated, or widowed. What is the scale of measurement for this question?((Nominal)) |
| Respondents were asked, "Do you now earn more than or less than you did five years ago?" What is this level of measurement?((Ordinal)) |
| Which word is NOT part of the definition of descriptive statistics?((Predicting)) |
| The reported unemployment is 5.5% of the population. What measurement scale is used to measure unemployment?((Ratio)) |
| The Equal Employment Opportunity Act requires employers to classify their employees by gender and national origin. Which level of measurement is this?((Nominal)) |
| What level of measurement is the Centigrade temperature scale?((Interval)) |
| What type of variable is the number of gallons of gasoline pumped by a filling station during a day?((Continuous)) |
| The performance of personal and business investments is measured as a percentage called "return on investment." What type of variable is "return on investment"?((Continuous)) |
| What type of variable is the number of robberies reported in your city?((Quantitative)) |
| What type of variable is the number of auto accidents reported in a given month?((Discrete)) |
| The names of the positions in a corporation, such as chief operating officer or controller, are examples of what type of variable?((Qualitative)) |
| What type of variable is "pounds of popcorn" served at a movie theater?((Continuous)) |
| The final rankings of the top 20 NCAA college basketball teams are an example of which level of measurement?((Ordinal)) |
| Your height and weight are examples of which level of measurement?((Ratio)) |
| Shoe style is an example of what level of measurement?((Nominal)) |
| The general process of gathering, organizing, summarizing, analyzing, and interpreting data is called((statistics.)) |
| The Nielsen Ratings break down the number of people watching a particular television show by age. What level of measurement is age?((Ratio)) |
| An example of a qualitative variable is((color of ink in a pen.)) |
| Which one of the following is NOT an example of discrete data?((Number of miles between New York City and Chicago)) |
| What level of measurement is a person's "favorite sport"?((Nominal)) |
| A group of women tried five brands of fingernail polish and ranked them according to preference. What level of measurement is this?((Ordinal)) |
| A university wishes to conduct a student survey. In one of the questions students are asked to mark their gender as either male or female. Gender is an example of the((nominal scale.)) |
| Income is a variable often used in business and economics. Income is an example of a variable that uses the((ratio scale.)) |
| When statisticians analyze sample data in order to draw conclusions about the characteristics of a population, this is referred to as((statistical inference.)) |
| The length of a bridge, measured in meters, is an example of((quantitative data.)) |
| A frequency distribution is a grouping of quantitative data into overlapping classes showing the number of observations in each class.((FALSE)) |
| A frequency table for qualitative data has class limits.((FALSE)) |
| To summarize the gender of students attending a college, the number of classes in a frequency table depends on the number of students.((FALSE)) |
| In frequency distributions, classes are mutually exclusive if each individual, object, or measurement is included in only one category.((TRUE)) |
| In a bar chart, the horizontal axis is usually labeled with the values of a qualitative variable.((TRUE)) |
| In a bar chart, the heights of the bars represent the frequencies in each class.((TRUE)) |
| The midpoint of a class is halfway between the lower and upper limits.((TRUE)) |
| A class interval can be determined by subtracting the lower limit of a class from the lower limit of the next higher class.((TRUE)) |
| To convert a frequency distribution to a relative frequency distribution, divide each class frequency by the sum of the class frequencies.((TRUE)) |
| To convert a frequency distribution to a relative frequency distribution, divide each class frequency by the number of classes.((FALSE)) |
| A pie chart is similar to a relative frequency distribution.((TRUE)) |
| A pie chart shows the relative frequency in each class.((TRUE)) |
| To construct a pie chart, relative class frequencies are used to graph the "slices" of the pie.((TRUE)) |
| A cumulative frequency distribution is used when we want to determine how many observations lie above or below certain values.((TRUE)) |
| A frequency polygon is a very useful graphic technique when comparing two or more distributions.((TRUE)) |
| Monthly commissions of first-year insurance brokers are $1,270, $1,310, $1,680, $1,380, $1,410, $1,570, $1,180, and $1,420. These figures are referred to as((raw data.)) |
| A small sample of computer operators shows monthly incomes of $1,950, $1,775, $2,060, $1,840, $1,795, $1,890, $1,925, and $1,810. What are these ungrouped numbers called?((Raw data)) |
| When data are collected using a quantitative, ratio variable, what is true about a frequency distribution that summarizes the data?((Upper and lower class limits must be calculated.)) |
| When data are collected using a qualitative, nominal variable, what is true about a frequency table that summarizes the data?((A pie chart can be used to summarize the data.)) |
| When data are collected using a qualitative, nominal variable (e.g., male or female), what is true about a frequency table that summarizes the data?((The number of classes corresponds to the number of a variable's values.)) |
| A student was interested in the cigarette-smoking habits of college students and collected data from an unbiased random sample of students. The data are summarized in the following table: What is wrong with this frequency table?((The classes are not mutually exclusive.)) |
| A student was interested in the cigarette-smoking habits of college students and collected data from an unbiased random sample of students. The data are summarized in the following table: What type of chart best represents the frequency table?((Bar chart)) |
| A student was interested in the cigarette-smoking habits of college students and collected data from an unbiased random sample of students. The data are summarized in the following table: What type of chart best represents the relative class frequencies?((Pie chart)) |
| When a class interval is expressed as 100 up to 200,((observations with values of 200 are excluded from the class.)) |
| For a relative frequency distribution, relative frequency is computed as((the class frequency divided by the number of observations.)) |
| The relative frequency for a class represents the((percentage of observations in the class.)) |
| A group of 100 students was surveyed about their interest in a new International Studies program. Interest was measured in terms of high, medium, or low. In the study, 30 students responded high interest, 40 students responded medium interest, and 30 students responded low interest. What is the relative frequency of students with high interest?((0.30)) |
| A group of 100 students were surveyed about their interest in a new Economics major. Interest was measured in terms of high, medium, or low. In the study, 30 students responded high interest, 50 students responded medium interest, and 20 students responded low interest. What is the best way to illustrate the relative frequency of student interest?((Use a pie chart.)) |
| The monthly salaries of a sample of 100 employees were rounded to the nearest $10. They ranged from a low of $1,040 to a high of $1,720. If we want to condense the data into seven classes, what is the most convenient class interval?(($100 )) |
| A student was studying the political party preferences of a university's student population. The survey instrument asked students to identify themselves as a Democrat or a Republican. This question is flawed because((the categories are not exhaustive.)) |
| A student was studying the political party preferences of a university's student population. The survey instrument asked students to identify their political preferences—for example, Democrat, Republican, Libertarian, or another party. The best way to illustrate the frequencies for each political preference is a((bar chart.)) |
| A student was studying the political party preferences of a university's student population. The survey instrument asked students to identify their political preferences—for example, Democrat, Republican, Libertarian, or another party. The best way to illustrate the relative frequency distribution is a((pie chart.)) |
| What is the following table called?((Frequency distribution)) |
| For the following distribution of heights, what are the limits for the class with the greatest frequency? ((65 and up to 70)) |
| In a frequency distribution, the number of observations in a class is called the class((frequency.)) |
| Why are unequal class intervals sometimes used in a frequency distribution?((To avoid a large number of classes with very small frequencies.)) |
| The number of employees less than the upper limit of each class at Lloyd's Fast Food Emporium is shown in the following table: What is it called?((A cumulative frequency distribution)) |
| Here is a sample distribution of hourly earnings in Paul's Cookie Factory: The limits of the class with the smallest frequency are(($12.00 and up to $15.00.)) |
| Refer to the following distribution of commissions: What is the relative frequency for salespeople who earn from $1,600 up to $1,800?((0.20)) |
| Refer to the following distribution of commissions: To plot a cumulative frequency distribution, the first coordinate would be((X = 600, Y = 0.)) |
| Refer to the following distribution of commissions: What is the relative frequency of salespeople who earn $1,600 or more?((30.8%)) |
| Refer to the following distribution of commissions: For the preceding distribution, what is the midpoint of the class with the greatest frequency?((1,500)) |
| Refer to the following distribution of commissions: What is the class interval?((200)) |
| Refer to the following wage breakdown for a garment factory: What is the class interval for the preceding table of wages?(($3 )) |
| Refer to the following wage breakdown for a garment factory: What is the class midpoint for the class with the greatest frequency?(($8.50 )) |
| Refer to the following wage breakdown for a garment factory: What are the class limits for the class with the smallest frequency?((13 and up to 16)) |
| Refer to the following distribution of ages: For this distribution of ages, what is the relative class frequency for the lowest class?((0.20)) |
| Refer to the following distribution of ages:What is the class interval?((10)) |
| Refer to the following distribution of ages: What is the class midpoint of the highest class?((65)) |
| Refer to the following information from a frequency distribution for heights of college women recorded to the nearest inch: the first two class midpoints are 62.5" and 65.5". What is the class interval?((3")) |
| Refer to the following information from a frequency distribution for heights of college women recorded to the nearest inch: the first two class midpoints are 62.5" and 65.5". What are the class limits for the lowest class?((61 and up to 64)) |
| Refer to the following information from a frequency distribution for heights of college women recorded to the nearest inch: the first two class midpoints are 62.5" and 65.5". What are the class limits for the third class?((67 and up to 70)) |
| Refer to the following distribution: What is the relative class frequency for the $25 up to $35 class?((0.04)) |
| Refer to the following distribution: What is the class midpoint for the $45 up to $55 class?((50)) |
| Refer to the following distribution: What are the class limits for the class with the highest frequency?((55 up to 65)) |
| Refer to the following frequency distribution of days absent during a calendar year by employees of a manufacturing company: How many employees were absent for 3 up to 6 days?((31)) |
| Refer to the following frequency distribution of days absent during a calendar year by employees of a manufacturing company: How many employees were absent fewer than six days?((91)) |
| Refer to the following frequency distribution of days absent during a calendar year by employees of a manufacturing company: How many employees were absent six or more days?((22)) |
| Refer to the following frequency distribution of days absent during a calendar year by employees of a manufacturing company: How many employees were absent for 6 up to 12 days?((20)) |
| Refer to the following breakdown of responses to a survey of room service in a hotel:What is the class interval for this frequency table?((None apply)) |
| Refer to the following breakdown of responses to a survey of room service in a hotel: What is the class with the greatest frequency?((Highly satisfied)) |
| Refer to the following breakdown of responses to a survey of room service in a hotel: What percentage of the responses indicated that customers were satisfied?((33%)) |
| Refer to the following breakdown of responses to a survey of room service in a hotel: What type of chart should be used to describe the frequency table?((A bar chart)) |
| Refer to the following breakdown of responses to a survey of room service in a hotel: What type of chart should be used to show relative class frequencies?((A pie chart)) |
| Refer to the following breakdown of responses to a survey of "Are you concerned about being tracked while connected to the Internet?" What is the class interval for the preceding frequency table?((None apply)) |
| Refer to the following breakdown of responses to a survey of "Are you concerned about being tracked while connected to the Internet?" What is the class with the greatest frequency?((Very concerned)) |
| Refer to the following breakdown of responses to a survey of "Are you concerned about being tracked while connected to the Internet?" What percentage of the responses indicated that users were somewhat concerned?((20%)) |
| Refer to the following breakdown of responses to a survey of "Are you concerned about being tracked while connected to the Internet?" What type of chart should be used to describe the frequency table?((A bar chart)) |
| Refer to the following breakdown of responses to a survey of "Are you concerned about being tracked while connected to the Internet?" What type of chart should be used to show relative class frequencies?((A pie chart)) |
| Refer to the following breakdown of responses to a survey of "How confident are you that you saved enough to retire?" What is the class interval for the preceding frequency table?((None apply)) |
| Refer to the following breakdown of responses to a survey of "How confident are you that you saved enough to retire?" What is the class with the greatest frequency?((Somewhat confident)) |
| Refer to the following breakdown of responses to a survey of "How confident are you that you saved enough to retire?" What percentage of the responses indicated that users were very confident?((21%)) |
| Refer to the following breakdown of responses to a survey of "How confident are you that you saved enough to retire?" What type of chart should be used to describe the frequency table?((A bar chart)) |
| Refer to the following breakdown of responses to a survey of "How confident are you that you saved enough to retire?" What type of chart should be used to show relative class frequencies?((A pie chart)) |
| A pie chart shows the((relative frequencies of a qualitative variable.)) |
| A table summarizing a set of data showing the fraction of the total number of items in several classes is a((relative frequency table.)) |
| In order to convert class frequency to relative class frequency, we((divide the frequency of the class by the sample size. )) |
| In constructing a frequency distribution, the approximate class interval is computed as(((maximum value − minimum value)/(number of classes).)) |
| A value that is typical or representative of the data is referred to as a measure of central location.((TRUE)) |
| The arithmetic mean is the sum of the quantitative observations divided by the total number of observations((TRUE)) |
| For a set of data arranged or sorted in numerical order, the value of the observation in the center is called the weighted mean.((FALSE)) |
| A set of o1rdinal-, interval-, or ratio-level data may have only one mode.((FALSE)) |
| The mode is the value of the observation that appears most frequently.((TRUE)) |
| Extremely high or low scores affect the value of the median.((FALSE)) |
| The sum of the deviations from the mean for the set of numbers 4, 9, and 5 will equal zero.((TRUE)) |
| In a sample of 10 people, 3 persons earn $8 an hour, 6 earn $9 an hour, and 1 earns $12 an hour. The weighted mean hourly wage is $9.((TRUE)) |
| For any distribution, there is an equal number of values above and below the mean.((FALSE)) |
| Variation describes the degree of dispersion in the data.((TRUE)) |
| The variance is the mean of the sum of the squared deviations between each observation and the median.((FALSE)) |
| The standard deviation is the positive square root of the variance.((TRUE)) |
| For any data set, Chebyshev's theorem estimates the proportion of observations that occurs within k standard deviations of the mean, where k is greater than 1.0.((TRUE)) |
| In a company, the standard deviation of the ages of female employees is 6 years and the standard deviation of the ages of male employees is 10 years. These statistics indicate that the dispersion of age is greater for females than for males.((FALSE)) |
| According to the Empirical rule, about 95% of the observations lie within plus and minus 2.00 standard deviations.((TRUE)) |
| The geometric mean is the nth root of the product of n observations.((TRUE)) |
| The sum of the deviations of each data value from this measure of central location will always be zero.((Mean)) |
| For any data set, which measures of central location have only one value?((Mean and median)) |
| Which measures of central location are not affected by extremely small or extremely large values?((Mode and median)) |
| What is the relationship among the mean, median, and mode in a symmetric distribution?((They are all equal.)) |
| For a data set, half of the observations are always greater than the ________.((median)) |
| What is the lowest level of measurement to which a median can be computed?((Ordinal)) |
| For a data set with an odd number of observations that have been sorted from smallest to largest values, where is the median located?(((n + 1)/2)) |
| Which one of the following is referred to as the population mean?((µ)) |
| On a finance exam, 15 accounting majors had an average grade of 90. On the same exam, 7 marketing majors averaged 85, and 10 finance majors averaged 93. What is the weighted mean for all 32 students taking the exam?((89.84)) |
| A survey item asked students to indicate their class in college: freshman, sophomore, junior, or senior. Which measure(s) of central location would be appropriate for the data generated by that questionnaire item?((Mode and median)) |
| What is the median of 26, 30, 24, 32, 32, 31, 27, and 29?((29.5)) |
| The net incomes (in $millions) of a sample of steel fabricators are $86, $67, $86, and $85. What is the modal net income?(($86 )) |
| A stockbroker placed the following order for a customer: • 50 shares of Kaiser Aluminum at $104 a share • 100 shares of GTE at $25.25 a share • 20 shares of Boston Edison at $9.125 a share What is the weighted arithmetic mean price per share? (($46.51 )) |
| During the past six months, a purchasing agent placed the following three orders for coal: Tons of Coal 1,200 3,000 500 Price Per Ton $ 28.50 $ 87.25 $ 88.00 What is the weighted arithmetic mean price per ton?(($72.33 )) |
| A sample of single persons receiving Social Security payments revealed these monthly benefits: $826, $699, $1,087, $880, $839, and $965. How many observations are below the median?((3)) |
| Over the last six months, the following numbers of absences have been reported: 6, 0, 10, 14, 8, and 0. What is the median number of monthly absences?((7)) |
| Assume a student received the following grades for the semester: History, B; Statistics, A; Spanish, C; and English, C. History and English are 5 credit-hour courses, Statistics a 4 credit-hour course, and Spanish is a 3 credit-hour course. If 4 grade points are assigned for an A, 3 for a B, and 2 for a C, what is the weighted mean grade for the semester?((2.76)) |
| A sample of the paramedical fees charged by clinics revealed these amounts: $55, $49, $50, $45, $52, and $55. What is the median charge?(($51.00 )) |
| The times (in minutes) that several underwriters took to review applications for similar insurance coverage are 50, 230, 52, and 57. What is the median length of time required to review an application?((54.5)) |
| A bottling company offers three kinds of delivery service: instant, same day, and within five days. The profit per delivery varies according to the kind of delivery. The profit for an instant delivery is less than the other kinds because the driver has to go directly to a grocery store with a small load and return to the bottling plant. To find out what effect each type of delivery has on the profit picture, the company summarized the data in the following table based on deliveries for the previous quarter. What is the weighted mean profit per delivery? (($97 )) |
| For the most recent seven years, the U.S. Department of Education reported the following number of bachelor's degrees awarded in computer science: 4,033; 5,652; 6,407; 7,201; 8,719; 11,154; 15,121. What is the annual arithmetic mean number of degrees awarded?((About 8,327)) |
| A question in a market survey asks for a respondent's favorite car color. Which measure of central location should be used to summarize this question?((Mode)) |
| Sometimes, a data set has two values that have the highest and equal frequencies. In this case, the distribution of the data can best be described as ________.((bimodal (having two modes))) |
| A disadvantage of using an arithmetic mean to summarize a set of data is that ________.((it can be biased by one or two extremely small or large values)) |
| The mean, as a measure of central location, would be inappropriate for which one of the following?((Marital status of college students at a particular university)) |
| What is a disadvantage of the range as a measure of dispersion?((It is based on only two observations.)) |
| A purchasing agent for a trucking company is shopping for replacement tires for their trucks from two suppliers. The suppliers' prices are the same. However, Supplier A's tires have an average life of 60,000 miles with a standard deviation of 10,000 miles. Supplier B's tires have an average life of 60,000 miles with a standard deviation of 2,000 miles.Which of the following statements is true?((The life of Supplier B's tire is more predictable than the life of Supplier A's tires.)) |
| The sum of the differences between sample observations and the sample mean is equal to ________.((zero)) |
| If the variance of the "number of daily parking tickets" issued is 100, the standard deviation is defined as the ________.((square root of the variance of the "number of daily parking tickets")) |
| What is the relationship between the variance and the standard deviation?((Variance is the square of the standard deviation.)) |
| According to Chebyshev's theorem, at least what percent of the observations lie within plus and minus 1.75 standard deviations of the mean?((67%)) |
| For a sample of similar-sized all-electric homes, the March electric bills were (to the nearest dollar): $212, $191, $176, $129, $106, $92, $108, $109, $103, $121, $175, and $194. What is the range?(($120 )) |
| The following are the weekly amounts of welfare payments made by the federal government to a sample of six families: $139, $136, $130, $136, $147, and $136. What is the range?(($17 )) |
| For the past week, a company's common stock closed with the following prices: $61.5, $62, $61.25, $60.875, and $61.5. What was the price range?(($1.125)) |
| The monthly amounts spent for food by families of four receiving food stamps approximates a symmetrical, normal distribution. The sample mean is $150 and the standard deviation is $20. Using the Empirical rule, about 95% of the monthly food expenditures are between what two amounts?(($110 and $190)) |
| The ages of all the patients in the isolation ward of the hospital are 38, 26, 13, 41, and 22. What is the population variance?((106.8)) |
| A sample of assistant professors on the business faculty at state-supported institutions in Ohio revealed the mean income to be $72,000 for nine months, with a standard deviation of $3,000. Using Chebyshev's theorem, what proportion of the faculty earns more than $66,000, but less than $78,000?((At least 75%)) |
| A population consists of all the weights of all defensive tackles on a university's football team. They are Johnson, 204 pounds; Patrick, 215 pounds; Junior, 207 pounds; Kendron, 212 pounds; Nicko, 214 pounds; and Cochran, 208 pounds. What is the population standard deviation (in pounds)?((About 4)) |
| A sample of small bottles and their contents has the following weights (in grams): 4, 2, 5, 4, 5, 2, and 6. What is the sample variance of bottle weight?((2.33)) |
| The distribution of a sample of the outside diameters of PVC pipes approximates a symmetrical, bell-shaped distribution. The arithmetic mean is 14.0 inches, and the standard deviation is 0.1 inches. About 68% of the outside diameters lie between what two amounts?((13.9 and 14.1 inches)) |
| The sample variance of hourly wages was 10. What is the sample standard deviation?(($3.16 )) |
| Based on the Empirical rule, what percent of the observations will lie between plus or minus two standard deviations from the mean?((95%)) |
| A sample of wires coming off the production line was tested for tensile strength. The statistical results (in PSI) were the following:According to the Empirical rule, the middle 95% of the wires tested had a tensile strength between approximately what two values?((420 and 580)) |
| In the calculation of the arithmetic mean for grouped data, which value is used to represent all the values in a particular class?((The class midpoint)) |
| The net annual sales of a sample of small retail clothing stores were organized into the following relative frequency distribution.What is the mean net sales (in $ millions)?((Mean cannot be computed.)) |
| Each person who applies for an assembly job at Robert's Electronics is given a mechanical aptitude test. One part of the test involves assembling a plug-in unit based on numbered instructions. A sample of the length of time it took 42 persons to assemble the unit was organized into the following frequency distribution.What is the standard deviation (in minutes)?((3.89)) |
| Consider two populations with the same mean. Since they have the same mean, then((none of these is correct.)) |
| The sample mean((is found by adding all data values and dividing them by n.)) |
| Which measure of central location is used to determine an average annual percent increase?((Geometric mean)) |
| The U.S. Federal Aviation Administration reported that passenger revenues on international flights increased from $528 million in 1986 to $5,100 million in 2009. What is the geometric mean annual percent increase in international passenger revenues?((10.4)) |
| The Investment Research Institute reported in its Mutual Fund Fact Book that the number of mutual funds increased from 5,725 in 1999 to 7,977 in 2009. What is the geometric mean annual percent increase in the number of funds?((3.37)) |
| Production of passenger cars in Japan increased from 3.94 million in 1999 to 6.74 million in 2009. What is the geometric mean annual percent increase?((5.5)) |
| The number of students at a local university increased from 2,500 students to 5,000 students in 10 years. Based on a geometric mean, the university grew at an average percentage rate of((7.2 percent per year.)) |
| The variance of a sample of 121 observations equals 441. The standard deviation of the sample equals((21)) |
| When computing the arithmetic mean, the smallest value in the data set((can be any value.)) |
| The probability of rolling a 3 or 2 on a single die is an example of conditional probability.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The probability of rolling a 3 or 2 on a single die is an example of mutually exclusive events.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| An individual can assign a subjective probability to an event based on the individual's knowledge about the event.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| To apply the special rule of addition, the events must be mutually exclusive.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A joint probability measures the likelihood that two or more events will happen concurrently.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The joint probability of two independent events, A and B, is computed as P(A and B) = P(A) × P(B).((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The joint probability of two events, A and B, that are NOT independent is computed as((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A coin is tossed four times. The joint probability that all four tosses will result in a head is 1/4 or 0.25.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| If there are "m" ways of doing one thing, and "n" ways of doing another thing, the multiplication formula states that there are (m) × (n) ways of doing both.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A combination of a set of objects is defined by the order of the objects.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The complement rule states that the probability of an event not occurring is equal to 1 minus the probability of its occurrence.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| If two events are mutually exclusive, then P(A and B) = P(A) × P(B).((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| An illustration of an experiment is turning the ignition key of an automobile as it comes off the assembly line to determine whether or not the engine will start.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Bayes' theorem is a method to revise the probability of an event given additional information.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Bayes' theorem is used to calculate a subjective probability.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The National Center for Health Statistics reported that of every 883 deaths in recent years, 24 resulted from an automobile accident, 182 from cancer, and 333 from heart disease. What is the probability that a particular death is due to an automobile accident?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| If two events A and B are mutually exclusive, what does the special rule of addition state?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| What does the complement rule state?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Which approach to probability is exemplified by the following formula? Probability of an event :No of time event occurred in the post/Total number of observationsThe empirical approach((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A firm offers routine physical examinations as part of a health service program for its employees. The exams showed that 8% of the employees needed corrective shoes, 15% needed major dental work, and 3% needed both corrective shoes and major dental work. What is the probability that an employee selected at random will need either corrective shoes or major dental work?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A survey of top executives revealed that 35% of them regularly read Time magazine, 20% read Newsweek, and 40% read U.S. News & World Report. A total of 10% read both Time and U.S. News & World Report. What is the probability that a particular top executive reads either Time or U.S. News & World Report regularly?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A study by the National Park Service revealed that 50% of the vacationers going to the Rocky Mountain region visit Yellowstone Park, 40% visit the Grand Tetons, and 35% visit both. What is the probability that a vacationer will visit at least one of these magnificent attractions?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A tire manufacturer advertises, "The median life of our new all-season radial tire is 50,000 miles. An immediate adjustment will be made on any tire that does not last 50,000 miles." You purchased four of these tires. What is the probability that all four tires will wear out before traveling 50,000 miles?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A sales representative calls on four hospitals in Westchester County. It is immaterial what order he calls on them. How many ways can he organize his calls?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| There are 10 AAA batteries in a box and 3 are defective. Two batteries are selected without replacement. What is the probability of selecting a defective battery followed by another defective battery?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Giorgio offers the person who purchases an 8-ounce bottle of Allure two free gifts, chosen from the following: an umbrella, a 1-ounce bottle of Midnight, a feminine shaving kit, a raincoat, or a pair of rain boots. If you purchased Allure, what is the probability you randomly select an umbrella and a shaving kit in that order?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A board of directors consists of eight men and four women. A four-member search committee is randomly chosen to recommend a new company president. What is the probability that all four members of the search committee will be women?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A lamp manufacturer designed five lamp bases and four lampshades that could be used together. How many different arrangements of base and shade can be offered?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A gumball machine has just been filled with 50 black, 150 white, 100 red, and 100 yellow gumballs that have been thoroughly mixed. Sue and Jim each purchase one gumball. What is the likelihood that both Sue and Jim will get red gumballs?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| What does 6!2!/4!3! Equal?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| In a management trainee program, 80% of the trainees are female, while 20% are male. Ninety percent of the females attended college; 78% of the males attended college. A management trainee is selected at random. What is the probability that the person selected is a female who did NOT attend college?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| In a management trainee program, 80% of the trainees are female, while 20% are male. Ninety percent of the females attended college; 78% of the males attended college. A management trainee is selected at random. What is the probability that the person selected is a female who attended college?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| In a management trainee program, 80% of the trainees are female, while 20% are male. Ninety percent of the females attended college; 78% of the males attended college. A management trainee is selected at random. What is the probability that the person selected is a male who did NOT attend college?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| In a management trainee program, 80% of the trainees are female, while 20% are male. Ninety percent of the females attended college; 78% of the males attended college. A management trainee is selected at random. What is the probability that the person selected is a male who did NOT attend college?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| In a management trainee program, 80% of the trainees are female, while 20% are male. Ninety percent of the females attended college; 78% of the males attended college. A management trainee is selected at random. What is the probability that the person selected is a female who attended college?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A supplier delivers an order for 20 electric toothbrushes to a store. By accident, three of the electric toothbrushes are defective. What is the probability that the first two electric toothbrushes sold are defective?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| An electronics firm sells four models of stereo receivers, three amplifiers, and six speaker brands. When the four types of components are sold together, they form a "system." How many different systems can the electronics firm offer?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The numbers 0 through 9 are used in code groups of four to identify an item of clothing. Code 1083 might identify a blue blouse, size medium. The code group 2031 might identify a pair of pants, size 18, and so on. Repetitions of numbers are not permitted—in other words, the same number cannot be used more than once in a total sequence. As examples, 2,256, 2,562, or 5,559 would not be permitted. How many different code groups can be designed?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| How many permutations of the three letters C, D, and E are possible?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| You are assigned to design color codes for different parts. Three colors are used to code on each part. Once a combination of three colors is used—such as green, yellow, and red—these three colors cannot be rearranged to use as a code for another part. If there are 35 combinations, how many colors are available?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A developer of a new subdivision wants to build homes that are all different. There are three different interior plans that can be combined with any of five different home exteriors. How many different homes can be built?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Six basic colors are used in decorating a new condominium. They are applied to a unit in groups of four colors. One unit might have gold as the principal color, blue as a complementary color, red as the accent color, and touches of white. Another unit might have blue as the principal color, white as the complementary color, gold as the accent color, and touches of red. If repetitions are permitted, how many different units can be decorated?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The ABCD football association is considering a Super Ten Football Conference. The top 10 football teams in the country, based on past records, would be members of the Super Ten Conference. Each team would play every other team in the conference during the season and the team winning the most games would be declared the national champion. How many games would the conference commissioner have to schedule each year? (Remember, Oklahoma versus Michigan is the same as Michigan versus Oklahoma.)((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A rug manufacturer has decided to use seven compatible colors in her rugs. However, in weaving a rug, only five spindles can be used. In advertising, the rug manufacturer wants to indicate the number of different color groupings for sale. How many color groupings using the seven colors taken five at a time are there? (This assumes that five different colors will go into each rug—in other words, there are no repetitions of color.)((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The first card selected from a standard 52-card deck was a king. If it is returned to the deck, what is the probability that a king will be drawn on the second selection?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The first card selected from a standard 52-card deck was a king. If it is NOT returned to the deck, what is the probability that a king will be drawn on the second selection?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Which approach to probability assumes that events are equally likely?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| An experiment may have ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| When are two experimental outcomes mutually exclusive?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Probabilities are important information when ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The result of a particular experiment is called a(n) ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The probability of two or more events occurring concurrently is called a(n) ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The probability of a particular event occurring, given that another event has occurred, is known as a(n) ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A graphical method used to calculate joint and conditional probabilities is ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| When an experiment is conducted "without replacement," ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| If two events are independent, then their joint probability is computed with ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| When applying the special rule of addition for mutually exclusive events, the joint probability is ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| When an event's probability depends on the occurrence of another event, the probability is a(n) ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A group of employees of Unique Services will be surveyed about a new pension plan. In-depth interviews with each employee selected in the sample will be conducted. The employees are classified as follows: Classification Event Number of Employees Supervisors A 120 Maintenance B 50 Production C 1,460 Management D 302 Secretarial E 68 What is the probability that the first person selected is classified as a maintenance employee? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A group of employees of Unique Services will be surveyed about a new pension plan. In-depth interviews with each employee selected in the sample will be conducted. The employees are classified as follows: Classification Event Number of Employees Supervisors A 120 Maintenance B 50 Production C 1,460 Management D 302 Secretarial E 68 What is the probability that the first person selected is either in maintenance or in secretarial? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A group of employees of Unique Services will be surveyed about a new pension plan. In-depth interviews with each employee selected in the sample will be conducted. The employees are classified as follows: Classification Event Number of Employees Supervisors A 120 Maintenance B 50 Production C 1,460 Management D 302 Secretarial E 68 What is the probability that the first person selected is either in management or in supervision?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The process used to calculate the revised probability of an event given additional information can be obtained through ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Each salesperson in a large department store chain is rated on their sales ability and their potential for advancement. The data for the 500 sampled salespeople are summarized in the following table. Potential for Advancement Fair Good Excellent Sales ability Below average 16 12 22 Average 45 60 45 Above average 93 72 135 What is the probability that a salesperson selected at random has above-average sales ability and has excellent potential for advancement?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Each salesperson in a large department store chain is rated on his or her sales ability and potential for advancement. The data for the 500 sampled salespeople are summarized in the following table. Potential for Advancement Fair Good Excellent Sales ability Below average 16 12 22 Average 45 60 45 Above average 93 72 135 What is the probability that a salesperson selected at random will have average sales ability and good potential for advancement? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Each salesperson in a large department store chain is rated on his or her sales ability and potential for advancement. The data for the 500 sampled salespeople are summarized in the following table. Potential for Advancement Fair Good Excellent Sales ability Below average 16 12 22 Average 45 60 45 Above average 93 72 135 What is the probability that a salesperson selected at random will have below-average sales ability and fair potential for advancement? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Each salesperson in a large department store chain is rated on his or her sales ability and potential for advancement. The data for the 500 sampled salespeople are summarized in the following table. Potential for Advancement Fair Good Excellent Sales ability Below average 16 12 22 Average 45 60 45 Above average 93 72 135 What is the probability that a salesperson selected at random will have an excellent potential for advancement given he or she also has above-average sales ability? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Each salesperson in a large department store chain is rated on his or her sales ability and potential for advancement. The data for the 500 sampled salespeople are summarized in the following table. Potential for Advancement Fair Good Excellent Sales ability Below average 16 12 22 Average 45 60 45 Above average 93 72 135 What is the probability that a salesperson selected at random will have an excellent potential for advancement given he or she also has average sales ability? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A study of interior designers' opinions with respect to the most desirable primary color for executive offices showed the following: Primary Color Number of Opinions Red 92 Orange 86 Yellow 46 Green 91 Blue 37 Indigo 46 Violet 2 What is the probability that a designer does NOT prefer red? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A study of interior designers' opinions with respect to the most desirable primary color for executive offices showed the following: Primary Color Number of Opinions Red 92 Orange 86 Yellow 46 Green 91 Blue 37 Indigo 46 Violet 2 What is the probability that a designer does NOT prefer yellow? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A study of interior designers' opinions with respect to the most desirable primary color for executive offices showed the following: Primary Color Number of Opinions Red 92 Orange 86 Yellow 46 Green 91 Blue 37 Indigo 46 Violet 2 What is the probability that a designer does NOT prefer blue? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| An automatic machine inserts mixed vegetables into a plastic bag. Past experience revealed that some packages were underweight and some were overweight, but most of them had satisfactory weight. Weight % of Total Underweight 2.5 Satisfactory 90.0 Overweight 7.5 What is the probability of selecting three packages that are overweight? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| An automatic machine inserts mixed vegetables into a plastic bag. Past experience revealed that some packages were underweight and some were overweight, but most of them had satisfactory weight. Weight % of Total Underweight 2.5 Satisfactory 90.0 Overweight 7.5 What is the probability of selecting three packages that are satisfactory? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| In a finance class, the final grade is based on three tests. Historically, the instructor tells the class that the joint probability of scoring As on the first two tests is 0.5. A student assigns a probability of 0.9 that she will get an A on the first test. What is the probability that the student will score an A on the second test given that she scored an A on the first test?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Using the terminology of Bayes' theorem, a posterior probability can also be defined as a((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| If A and B are mutually exclusive events with P(A) = 0.2 and P(B) = 0.6, then P(A or B) = ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| If P(A) = 0.62, P(B) = 0.47, and P(A or B) = 0.88, then P(A and B) = ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A method of assigning probabilities based upon judgment, opinions, and available information is referred to as the ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Your favorite soccer team has two remaining matches to complete the season. The possible outcomes of a soccer match are win, lose, or tie. What is the possible number of outcomes for the season?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A random variable represents the outcome of an experiment.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The probability of a particular outcome must always be between 0.0 and 1.0 inclusive.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The random variable for a Poisson probability distribution can assume an infinite number of values.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A probability distribution is a mutually exclusive and collectively exhaustive listing of experimental outcomes that can occur by chance, and their corresponding probabilities.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| To construct a binomial probability distribution, the mean must be known.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| To construct a binomial distribution, it is necessary to know the total number of trials and the probability of success on each trial.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The mean of a probability distribution is called its expected value.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The variance of a probability distribution is based on the sum of squared differences from the mean multiplied by the probability of X.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The variance measures the skewness of a probability distribution.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The mean of a binomial distribution is the product of n and π.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The variance of a binomial distribution is found by nπ(1 − π).((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| In a Poisson distribution, the probability of success may vary from trial to trial.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The binomial probability distribution is always negatively skewed.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| When sampling is done without replacement from a finite population and the outcomes are measured as either a success or failure, the hypergeometric distribution should be applied.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| As a general rule of thumb, if the items selected for a sample are not replaced and the sample size is less than 5% of the population, the binomial distribution can be used to approximate the hypergeometric distribution.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| If the variance is 3.6 grams, what is the standard deviation?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A total of 60% of the customers of a fast-food chain order a hamburger, french fries, and a drink. If a random sample of 15 cash register receipts is selected, what is the probability that 10 or more will show that the above three food items were ordered?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Judging from recent experience, 5% of the computer keyboards produced by an automatic, high-speed machine are defective. If six keyboards are randomly selected, what is the probability that none of the keyboards are defective?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| On a very hot summer day, 5% of the production employees at Midland States Steel are absent from work. The production employees are randomly selected for a special in-depth study on absenteeism. What is the probability of randomly selecting 10 production employees on a hot summer day and finding that none of them are absent?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Sweetwater & Associates write weekend trip insurance at a very nominal charge. Records show that the probability that a motorist will have an accident during the weekend and file a claim is 0.0005. Suppose they wrote 400 policies for the coming weekend, what is the probability that exactly two claims will be filed?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A listing of all possible outcomes of an experiment and their corresponding probabilities of occurrence is called a ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Which one of the following is NOT a condition of the binomial distribution?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Which is true for a binomial distribution?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Which shape describes a Poisson distribution?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Sponsors of a local charity decided to attract wealthy patrons to its $500-a-plate dinner by allowing each patron to buy a set of 20 tickets for the gaming tables. The chance of winning a prize for each of the 20 plays is 50–50. If you bought 20 tickets, what is the chance of winning 15 or more prizes?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| What kind of distributions are the binomial and Poisson probability distributions?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Which of the following is correct about a probability distribution?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Data show that the weight of an offensive linesman may be any weight between 200 and 350 pounds. The distribution of weight is based on a ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Carlson Jewelers permits the return of their diamond wedding rings, provided the return occurs within two weeks of the purchase date. Their records reveal that 10% of the diamond wedding rings are returned. Five different customers buy a wedding ring. What is the probability that none of the customers return a ring?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| In a large metropolitan area, past records revealed that 30% of all the high school graduates go to college. From 20 graduates selected at random, what is the probability that exactly 8 will go to college?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Chances are 50–50 that a newborn baby will be a girl. For families with five children, what is the probability that all the children are girls?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A new car was put into production. It involved many assembly tasks. Each car was inspected at the end of the assembly line and the number of defects per unit was recorded. For the first 100 cars produced, there were 40 defective cars. Some of the cars had no defects, a few had one defect, and so on. The distribution of defects followed a Poisson distribution. Based on the first 100 cars produced, about how many out of every 1,000 cars assembled should have one or more defects?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The production department has installed a new spray machine to paint automobile doors. As is common with most spray guns, unsightly blemishes often appear because of improper mixtures or other problems. A worker counted the number of blemishes on each door. Most doors had no blemishes; a few had one; a very few had two; and so on. The average number was 0.5 per door. The distribution of blemishes followed the Poisson distribution. Out of 10,000 doors painted, about how many would have no blemishes?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A manufacturer of headache medicine claims it is 70% effective within a few minutes. That is, out of every 100 users, 70 get relief within a few minutes. A group of 12 patients are given the medicine. If the claim is true, what is the probability that eight have relief within a few minutes?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A true/false test consists of six questions. If you guess the answer to each question, what is the probability of getting all six questions correct?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A farmer who grows genetically engineered corn is experiencing trouble with corn borers. A random check of 5,000 ears revealed the following: Many of the ears contained no borers. Some ears had one borer. A few had two borers, and so on. The distribution of the number of borers per ear approximated the Poisson distribution. The farmer counted 3,500 borers in the 5,000 ears. What is the probability that an ear of corn selected at random will contain no borers?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A tennis match requires that a player win three of five sets to win the match. If a player wins the first two sets, what is the probability that the player wins the match, assuming that each player is equally likely to win each set?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A machine shop has 100 drill presses and other machines in constant use. The probability that a machine will become inoperative during a given day is 0.002. During some days, no machines are inoperative, but on other days, one, two, three, or more are broken down. What is the probability that fewer than two machines will be inoperative during a particular day?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A coin is tossed three times. The following table summarizes the experiment. What is the following table called? Number of Heads Probability of the Outcome 0 1/8 = 0.125 1 3/8 = 0.375 2 3/8 = 0.375 3 1/8 = 0.125 ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| What is the only variable in the Poisson probability formula?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Which of the following is NOT a characteristic of a binomial probability distribution?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| What must you know to develop a binomial probability distribution?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| To apply a Poisson probability distribution, the mean can be computed as ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| In a Poisson distribution, the variance is equal to ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| David's gasoline station offers 4 cents off per gallon if the customer pays in cash and does not use a credit card. Past evidence indicates that 40% of all customers pay in cash. During a one-hour period, 15 customers buy gasoline at this station. What is the probability that at least 10 pay in cash?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| David's gasoline station offers 4 cents off per gallon if the customer pays in cash and does not use a credit card. Past evidence indicates that 40% of all customers pay in cash. During a one-hour period, 15 customers buy gasoline at this station. What is the probability that all 15 pay in cash?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| David's gasoline station offers 4 cents off per gallon if the customer pays in cash and does not use a credit card. Past evidence indicates that 40% of all customers pay in cash. During a one-hour period, 15 customers buy gasoline at this station. What is the probability that more than 8 and less than 12 customers pay in cash?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| David's gasoline station offers 4 cents off per gallon if the customer pays in cash and does not use a credit card. Past evidence indicates that 40% of all customers pay in cash. During a one-hour period, 15 customers buy gasoline at this station. This situation is an example of what type of discrete probability distribution?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A statistics professor receives an average of five e-mail messages per day from students. Assume the number of messages approximates a Poisson distribution. What is the probability that on a randomly selected day she will have no messages?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A statistics professor receives an average of five e-mail messages per day from students. Assume the number of messages approximates a Poisson distribution. What is the probability that on a randomly selected day she will have five messages?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A statistics professor receives an average of five e-mail messages per day from students. Assume the number of messages approximates a Poisson distribution. What is the probability that on a randomly selected day she will have two messages?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A company is studying the number of monthly absences among its 125 employees. The following probability distribution shows the likelihood that people were absent 0, 1, 2, 3, 4, or 5 days last month. Number of Days Absent Probability 0 0.60 1 0.20 2 0.12 3 0.04 4 0.04 5 0.00 What is the mean number of days absent? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A company is studying the number of monthly absences among its 125 employees. The following probability distribution shows the likelihood that people were absent 0, 1, 2, 3, 4, or 5 days last month. Number of Days Absent Probability 0 0.60 1 0.20 2 0.12 3 0.04 4 0.04 5 0.00 What is the variance of the number of days absent? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A company is studying the number of monthly absences among its 125 employees. The following probability distribution shows the likelihood that people were absent 0, 1, 2, 3, 4, or 5 days last month. Number of Days Absent Probability 0 0.60 1 0.20 2 0.12 3 0.04 4 0.04 5 0.00 Given the probability distribution, which of the following predictions is correct? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A company is studying the number of monthly absences among its 125 employees. The following probability distribution shows the likelihood that people were absent 0, 1, 2, 3, 4, or 5 days last month. Number of Days Absent Probability 0 0.60 1 0.20 2 0.12 3 0.04 4 0.04 5 0.00 What is the mode of the distribution? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| For the following distribution: X P(x) 0 0.130 1 0.346 2 0.346 3 0.154 4 0.026 What is the mean of the distribution? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| For the following distribution: X P(x) 0 0.130 1 0.346 2 0.346 3 0.154 4 0.026 What is the variance of the distribution? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| For the following distribution: X P(x) 0 0.027 1 0.189 2 0.441 3 0.343 What is the mean of the distribution?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| For the following distribution: x P(x) 0 0.027 1 0.189 2 0.441 3 0.343 What is the variance of the distribution?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| For the following distribution: x P(x) 0 0.900 1 0.09 2 0.007 3 0.003 What is the mean of the distribution? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| For the following distribution: X P(x) 0 0.900 1 0.09 2 0.007 3 0.003 What is the variance of the distribution? ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The following is a binomial probability distribution with n = 3 and π = 0.20. X P(x) 0 0.512 1 0.384 2 0.096 3 0.008 The mean of the distribution is ________. ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The following is a binomial probability distribution with n = 3 and π = 0.20. X P(x) 0 0.512 1 0.384 2 0.096 3 0.008 The variance of the distribution is ________. ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The following is a Poisson probability distribution with µ = 0.1. x P(x) 0 0.9048 1 0.0905 2 0.0045 3 0.0002 The mean of the distribution is ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The following is a Poisson probability distribution with µ = 0.1. x P(x) 0 0.9048 1 0.0905 2 0.0045 3 0.0002 The variance of the distribution is ________. ((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| For a binomial distribution, the mean is 0.6 and n = 2. What is π for this distribution?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| For a binomial distribution, the mean is 4.0 and n = 8. What is π for this distribution?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The marketing department of a nationally known cereal maker plans to conduct a national survey to find out whether or not consumers of flake cereals can distinguish one of their favorite flake cereals. To test the questionnaire and procedure to be used, eight persons were asked to cooperate in an experiment. Five very small bowls of flake cereals were placed in front of a person. The bowls were labeled A, B, C, D, and E. The person was informed that only one bowl contained his or her favorite flake cereal. Suppose that the eight persons in the experiment were unable to identify their favorite cereal and just guessed which bowl it was in. What is the probability that none of the eight guessed correctly?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| An insurance agent has appointments with four prospective clients tomorrow. From past experience the agent knows that the probability of making a sale on any appointment is one out of five. Using the rules of probability, what is the likelihood that the agent will sell a policy to three of the four prospective clients?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| In which of the following discrete distributions does the probability of a success vary from one trial to the next?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Which of the following is a requirement for use of the hypergeometric distribution?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Affirmative action commitments by many organizations have led to an increase in the number of women in executive positions. Satellite Office Systems has vacancies for two executives that it will fill from among four women and six men. What is the probability that no woman is selected?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Affirmative action commitments by many organizations have led to an increase in the number of women in executive positions. Satellite Office Systems has vacancies for two executives that it will fill from among four women and six men. What is the probability that at least one woman is selected?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A type of probability distribution that shows the probability of x successes in n trials, where the probability of success remains the same from trial to trial, is referred to as a ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A measure of the long-run average value of a random variable used to represent the central location of a probability distribution is called a(n) ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| An experiment consists of making 80 telephone calls in order to sell a particular insurance policy. The random variable in this experiment is a ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The mean or expected value for a binomial probability distribution is ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| For any uniform probability distribution, the mean and standard deviation can be computed based on the maximum and minimum values of the random variable.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| For a uniformly distributed random variable, x, P(x) is constant.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| For a uniformly distributed random variable, x, P(x) = 1/(b − a).((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| When referring to the normal probability distribution, there is not just one; there is a "family" of normal probability distributions.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A group of normal distributions can have equal arithmetic means but different standard deviations.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Some normal probability distributions are positively skewed.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Within plus and minus one standard deviation of the mean, the area under any normal curve is about 68%.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The standard normal distribution is a special normal distribution with a mean of 0 and a standard deviation of 1.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The z-scores for X values greater than the mean are negative.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Nonstop Airlines determined that the mean number of passengers per flight is 152 with a standard deviation of 10 passengers. Practically all flights have between 142 and 162 passengers.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The number of different standard normal distributions is unlimited.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The normal distribution can be used to approximate a binomial distribution when nπ is less than 5.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A "continuity correction factor" is used to compute probabilities when using the normal distribution to approximate the binomial distribution.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| For the exponential distribution, the mean and standard deviation are equal.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The exponential distribution is a probability distribution for a random variable measured as a rate of an event occurring.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The shape of any uniform probability distribution is ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The mean of any uniform probability distribution is ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The standard deviation of any uniform probability distribution is ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The upper and lower limits of a uniform probability distribution are ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The time to fly between New York City and Chicago is uniformly distributed with a minimum of 120 minutes and a maximum of 150 minutes. What is the distribution's mean?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The time to fly between New York City and Chicago is uniformly distributed with a minimum of 120 minutes and a maximum of 150 minutes. What is the distribution's standard deviation?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The time to fly between New York City and Chicago is uniformly distributed with a minimum of 120 minutes and a maximum of 150 minutes. What is the probability that a flight is less than 135 minutes?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The time to fly between New York City and Chicago is uniformly distributed with a minimum of 120 minutes and a maximum of 150 minutes. What is the probability that a flight is more than 140 minutes?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The time to fly between New York City and Chicago is uniformly distributed with a minimum of 120 minutes and a maximum of 150 minutes. What is the probability that a flight is between 125 and 140 minutes?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| What is an important similarity between the uniform and normal probability distributions?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Which of the following is true regarding the normal distribution?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| For the normal distribution, the mean plus and minus two standard deviations will include about what percent of the observations?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| For a standard normal distribution, what is the probability that z is greater than 1.75?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| What is the area under the normal curve between z = 0.0 and z = 1.79?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| What is the area under the normal curve between z = −1.0 and z = −2.0?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| What is the probability that z is between 0.0 and 2.0?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The mean amount spent by a family of four on food is $500 per month with a standard deviation of $75. Assuming that the food costs are normally distributed, what is the probability that a family spends less than $410 per month?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Which of the following is a characteristic of the normal probability distribution?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| For a normal distribution, what is the likelihood (expressed as a percentage) that a random variable is within plus and minus two standard deviations of the mean?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The mean score of a college entrance test is 500; the standard deviation is 75. The scores are normally distributed. What percent of the students scored below 320?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The weekly incomes of a large group of executives are normally distributed with a mean of $2,000 and a standard deviation of $100. What is the z-score for an income of $2,100?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A new extended-life light bulb has an average life of 750 hours, with a standard deviation of 50 hours. If the life of these light bulbs approximates a normal distribution, about what percent of the distribution will be between 600 hours and 900 hours?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A study of a company's practice regarding the payment of invoices revealed that an invoice was paid an average of 20 days after it was received. The standard deviation equaled five days. Assuming that the distribution is normal, what percent of the invoices were paid within 15 days of receipt?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| An accelerated life test on a large number of type-D alkaline batteries revealed that the mean life for a particular use before they failed is 19.0 hours. The distribution of the lives approximated a normal distribution. The standard deviation of the distribution was 1.2 hours. About 95.44% of the batteries failed between what two values?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The mean of a normal distribution is 400 pounds. The standard deviation is 10 pounds. What is the probability of a weight between 415 pounds and the mean of 400 pounds?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The distribution of the annual incomes of a group of middle management employees approximated a normal distribution with a mean of $37,200 and a standard deviation of $800. About 68% of the incomes lie between what two incomes?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Which of the following is true in a normal distribution?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Tables of normal distribution probabilities are found in many statistics books. These probabilities are calculated from a normal distribution with ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Two normal distributions are compared. One has a mean of 10 and a standard deviation of 10. The second normal distribution has a mean of 10 and a standard deviation of 2. Which of the following is true?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A normally distributed random variable has ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The total area of a normal probability distribution is ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| In an illustration of a normal probability distribution, a shaded area represents ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The standard normal probability distribution is unique because it has ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The weekly mean income of a group of executives is $1,000 and the standard deviation of this group is $100. The distribution is normal. What percent of the executives have an income of $925 or less?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The weight of cans of fruit is normally distributed with a mean of 1,000 grams and a standard deviation of 50 grams. What percent of the cans weigh 860 grams or less?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| What is a normal distribution with a mean of 0 and a standard deviation of 1 called?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The seasonal output of a new experimental strain of pepper plants was carefully weighed. The mean weight per plant is 15.0 pounds, and the standard deviation of the normally distributed weights is 1.75 pounds. Of the 200 plants in the experiment, how many produced peppers weighing between 13 and 16 pounds?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Ball-Bearings, Inc. produces ball bearings automatically on a Kronar BBX machine. For one of the ball bearings, the mean diameter is set at 20.00 mm (millimeters). The standard deviation of the production over a long period of time was computed to be 0.150 mm. What percent of the ball bearings will have diameters of 20.27 mm or more?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A national manufacturer of unattached garages discovered that the distribution of the time for two construction workers to erect the Red Barn model is normally distributed with a mean of 32 hours and a standard deviation of 2 hours. What percent of the garages take between 32 and 34 hours to erect?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A large manufacturing firm tests job applicants. Test scores are normally distributed with a mean of 500 and a standard deviation of 50. Management is considering placing a new hire in an upper-level management position if the person scores in the upper sixth percent of the distribution. What is the lowest score a new hire must earn to qualify for a responsible position?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| An analysis of the grades on the first test in History 101 revealed that they approximate a normal curve with a mean of 75 and a standard deviation of 8. The instructor wants to award the grade of A to the upper 10% of the test grades. To the nearest percent, what is the dividing point between an A and a B grade?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The annual commissions per salesperson employed by a retailer of mobile communication devices averaged $40,000, with a standard deviation of $5,000. What percent of the salespersons earn between $32,000 and $42,000?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The mean of a normal probability distribution is 500 and the standard deviation is 10. About 95% of the observations lie between what two values?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A cola-dispensing machine is set to dispense a mean of 2.02 liters into a container labeled 2 liters. Actual quantities dispensed vary, and the amounts are normally distributed with a standard deviation of 0.015 liters. What is the probability a container will have less than 2 liters?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The employees of Cartwright Manufacturing are awarded efficiency ratings. The distribution of the ratings approximates a normal distribution. The mean is 400, the standard deviation is 50. What is the area under the normal curve between 400 and 482?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Suppose a tire manufacturer wants to set a mileage guarantee on its new XB 70 tire. Tests revealed that the tire's mileage is normally distributed with a mean of 47,900 miles and a standard deviation of 2,050 miles. The manufacturer wants to set the guaranteed mileage so that no more than 5% of the tires will have to be replaced. What guaranteed mileage should the manufacturer announce?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Customers of the Key Refining Company charge an average of $70 per month. The distribution of amounts charged is approximately normal, with a standard deviation of $10. What is the probability of selecting a credit card customer at random and finding the customer charged between $70 and $83?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Management is considering a bonus system to increase production. One suggestion is to pay a bonus on the highest 5% of production based on past experience. Past records indicate that an average of 4,000 units of a small assembly is produced during a week. The distribution of the weekly production is approximately normally distributed with a standard deviation of 60 units. If the bonus is paid on the upper 5% of production, the bonus will be paid on how many units or more?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The average score of 100 students taking a statistics final was 70, with a standard deviation of 7. Assuming a normal distribution, what is the probability that a student scored 90 or higher?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The average score of 100 students taking a statistics final was 70 with a standard deviation of 7. Assuming a normal distribution, what is the probability that a student scored greater than 65?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The average score of 100 students taking a statistics final was 70, with a standard deviation of 7. Assuming a normal distribution, what test score separates the top 5% of the students from the lower 95% of the students?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The average score of 100 students taking a statistics final was 70 with a standard deviation of 7. Assuming a normal distribution, what test score separates the top 25% of the students from the lower 75% of students?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A binomial distribution has 100 trials (n = 100) with a probability of success of 0.25 (π = 0.25). To apply the normal distribution to approximate the binomial, what are the mean and standard deviation?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A binomial distribution has 50 trials (n = 50) with a probability of success of 0.50 (π = 0.50). To use the normal distribution to approximate the binomial, what are the mean and standard deviation?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A binomial distribution has 100 trials (n = 100) with a probability of success of 0.25 (π = 0.25). We would like to find the probability of 75 or more successes using the normal distribution to approximate the binomial. Applying the continuity correction factor, what value would be used to calculate a z-score?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A binomial distribution has 100 trials (n = 100) with a probability of success of 0.25 (π = 0.25). We would like to find the probability of 34 or more successes using the normal distribution to approximate the binomial. Applying the continuity correction factor, what z-score should be used?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A binomial distribution has 50 trials (n = 50) with a probability of success of 0.50 (π = 0.50). We would like to find the probability of 34 or more successes using the normal distribution to approximate the binomial. Applying the continuity correction factor, what z-score should be used?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| If an average of 12 customers are served per hour, then one customer arrives every ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| If an average of 60 customers are served per hour, then one customer arrives every ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| If an average of 12 12 customers are served per hour, what is the probability that the next customer will arrive in 6 minutes or less?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| If an average of 12 customers are served per hour, what is the probability that the next customer will arrive in 3 minutes or less?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The center of a normal probability distribution is ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The z-value for a standard normal distribution ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Consider a continuous random variable x, which is uniformly distributed between 65 and 85. The probability of x taking on a value between 75 to 90 is ________.((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| Consider a standard normal random variable z. What is the value of z if the area to the right of z is 0.2643?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| The average starting salary of individuals with a master's degree in statistics is normally distributed with a mean of $48,000 and a standard deviation of $6,000. What is the probability that a randomly selected individual with a master's in statistics will get a starting salary of at least $55,000?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A college professor noted that the grades of his students in an introductory statistics class were normally distributed with a mean of 76.5 and a standard deviation of 9. If 67.36% of his students received grades of C or above, what is the minimum score of those students receiving a grade of at least a C?((حل أسئلة كويز2 تتوفر للمشتركين فقط)) |
| A survey includes a question about marital status that has the following responses: single, married, divorced, separated, or widowed. What is the level of measurement for this question? ((nominal)) |
| A survey includes a question about marital status that has the following responses: single, married, divorced, separated, or widowed. What is the level of measurement for this question? ((Nominal)) |
| Refer to the following frequency distribution of days absent during a calendar year by employees of a manufacturing company: How many employees were absent for fewer than six days? ((91 employees)) |
| For a data set with an odd number of observations that have been sorted from smallest to largest values, where is the median located? ((The observation in the middle)) |
| For a seven-year period, the U.S. Department of Education reported the following number of bachelor's degrees awarded in computer science: What is the annual arithmetic mean number of degrees awarded? ((10,624)) |
| In the following set of data: (1, 3, 4, 5, 7, 17, 100), what are the first, second, and third quartiles? ((Q1 = 3, Q2 = 5, Q3 = 17)) |
| Laura and Zoey sold a total of 600 computers. Laura sold 5 times as many computers as Zoey. How many did each sell? ((Zoey: 100 حاسوب, Laura: 500 حاسوب)) |
| Convert the following decimal to a percent: 0.007 ((0.7%)) |
| In Professor Shannon's economics class there are 12 male students. Females represent 60% of the class total. How many students does Professor Shannon have in his economics class? ((30 طالب)) |
| Lee Jenkins worked the following hours as a manager for a local Pizza Hut: 20 1/4, 3 1/4, 7 1/2, and 3 3/4. How many total hours did Lee work? ((35.25 ساعة)) |
| The cost of a hanging flowered plant is $25.95 for the florist, who purchases 300 of these plants. What is the total cost to the florist? (($7,785)) |
| Convert to proper fraction or mixed number (do not reduce to lowest terms): 0.8 ((8/10)) |
| Solve for the unknown, showing all work. 7 (A − 4) = 21; A equals: ((7)) |
| Ross and Rita sell iPhones. Over the past year they together sold 360 phones. Assuming Ross sells 5 times as many as Rita, how many iPhones did Rita sell? ((60 iPhones)) |
| The sales tax in Jorge's state is 7%. Jorge bought a Ford Mustang having a sales tax of $1,928.22. What was the cost of the car? (($27,545.14)) |
| Huy traveled 10,850 miles. Huy’s Ford truck averaged 16 miles per gallon. Assuming a gallon of gas cost $3.10, what was Huy's gasoline cost for the trip? (($2,101.88)) |
| Complete by the shortcut method: 3,069.44 ÷ 1,000 ((3.06944)) |
| Jorge is 6 times as old as Maria. Jorge is 15 years older than Maria. What is Maria's age? ((3 years)) |
| Convert to percent (to nearest tenth of a percent): 5/6 ((83.3%)) |
| Marika is 8 times Barry's age. If the difference in their age is 7 years, how old is Marika? ((8 years)) |
| The median of a sample will always equal the _________ ((50th percentile)) |
| What is the sample standard deviation of the following numbers? 6, 4, 7, 3, 9 ((2.55)) |
| The ages of all employees at a small convenience store are 38, 26, 42, and 22. What is standard deviation of ages for this population? ((8.0)) |
| What is the sample variance of the following numbers? 8, 4, 7, 3, 9 ((6.7)) |
| What is the sample standard deviation of the following numbers? 3, 7, 2, 9, 4 ((2.3)) |
| The test scores for a class of 195 students are computed. What is the location of the test score associated with the third quartile? ((147th موقع)) |
| The average weekly pay at Wendy's is $812.88. Bill Long earns $885.11. How much is Bill over the average? ((72.23)) |
| Convert the following percent to a decimal: 1/4% ((0.0025)) |
| Convert the following percent to a decimal: 400% ((4.0)) |
| What is the sample standard deviation of the following numbers? 5, 3, 8, 2, 4 ((2.3)) |
| The ages of all employees at a small convenience store are 36, 32, 38, and 28. What is standard deviation of ages for this population? ((3.84)) |
| The test scores for a class of 223 students are computed. What is the location of the test score associated with the third quartile? ((167th موقع)) |
| For a data set with an odd number of observations that have been sorted from smallest to largest values, where is the median located? ((The observation in the middle)) |
| The ages of all employees at a small convenience store are 38, 26, 42, and 22. What is standard deviation of ages for this population? ((8.0)) |
| What is the sample standard deviation of the following numbers? 5, 3, 8, 2, 4 ((2.3)) |
| The test scores for a class of 195 students are computed. What is the location of the test score associated with the third quartile? ((147th موقع)) |
| What is the sample variance of the following numbers? 8, 4, 7, 3, 9 ((6.7)) |
| The median of a sample will always equal the _________ ((50th percentile)) |
| The average weekly pay at Wendy's is $812.88. Bill Long earns $885.11. How much is Bill over the average? ((72.23)) |
| The reported unemployment is 5.5% of the population. What level of measurement is used to measure unemployment? ((Ratio)) |
| What is the median charge for Lee Jenkins worked the following hours as a manager for a local Pizza Hut: 20 1/4, 3 1/4, 7 1/2, and 3 3/4? ((17)) |
| What is the sample standard deviation of the following numbers? 3, 7, 2, 9, 4 ((2.5)) |
| The test scores for a class of 159 students are computed. What is the location of the test score associated with the third quartile? ((120th موقع)) |
| The average weekly pay at Wendy's is $812.88. Bill Long earns $885.11. How much is Bill over the average? ((72.23)) |
| The reported unemployment is 5.5% of the population. What level of measurement is used to measure unemployment? ((Ratio)) |
| The median of a sample will always equal the _________ ((50th percentile)) |
| The median of a sample will always equal the _________blank. Multiple Choice mode mean 50th percentile All of these choices are correct. ((50th percentile)) |
| Refer to the following distribution: Cost of Textbooks Frequency $25 up to $35 3 35 up to 45 19 45 up to 55 9 55 up to 65 15 65 up to 75 14 What is the relative class frequency for the $25 up to $35 class? ((0.05)) |
| What is the class interval for the ages of employees at a small convenience store? ((10)) |
| The test scores for a class of 223 students are computed. What is the location of the test score associated with the third quartile? ((167th موقع)) |