Question 1

Suppose that the distribution of grocery purchases is thought to be symmetric.If the mean purchase is $23.14,what would the median purchase be?

Accepted Answer

For a symmetric distribution,t

Question 2

A store manager tracks the number of customer complaints each week.The following data reflect a random sample of ten weeks.   The standard deviation for these data is approximately 27.78.

Accepted Answer

A) True 
 B)False

Question 3

At a sawmill in Oregon,a process improvement team measured the diameters for a sample of 1,500 logs.The following summary statistics were computed: Q1 = 8.9 in.Q2 = 13.5 in.Q3 = 15.6 in   in.
Given this information,in a box and whisker plot,which of these four values will NOT appear?

Accepted Answer

A) 8.9 in. 
B) 13.5 in. 
C) 15.6 in. 
D) 14.2 in. 
A) 8.9 in. 
B) 13.5 in. 
C) 15.6 in. 
D) 14.2 in.

Question 4

The interquartile range is the difference between the mean and the median.

Accepted Answer

A) True 
 B)False

Question 5

In the annual report,a major food chain stated that the distribution of daily sales at its Detroit stores is known to be bell-shaped,and that 95 percent of all daily sales fell between $19,200 and $36,400.Based on this information,what were the mean sales?

Accepted Answer

A) Around $20,000 
B) Close to $30,000 
C) Approximately $27,800 
D) Can't be determined without more information. 
A) Around $20,000 
B) Close to $30,000 
C) Approximately $27,800 
D) Can't be determined without more information.

Question 6

A major automobile maker has two models of sedans.The first model has been shown to get an average of 27 mpg on the highway with a standard deviation equal to 5 mpg.The second model gets 33 mpg on average with a standard deviation of 8 mpg.Based on this information the first car model is relatively more variable than the second car model.

Accepted Answer

A) True 
 B)False

Question 7

The range is an ideal measure of variation since it is not sensitive to extreme values in the data.

Accepted Answer

A) True 
 B)False

Question 8

Consider the following data,which represent the number of miles that employees commute from home to work each day.There are two samples: one for males and one for females. Males:   Females:   Which of the following statements is true?

Accepted Answer

A) Females have the larger mean. 
B) The coefficient of variation is larger for females than for males. 
C) The coefficient of variation is larger for males than for females. 
D) Females have the larger range. 
A) Females have the larger mean. 
B) The coefficient of variation is larger for females than for males. 
C) The coefficient of variation is larger for males than for females. 
D) Females have the larger range.

Question 9

The sample mean is an estimate of μ and may be either higher or lower than μ depending on the sample.

Accepted Answer

A) True 
 B)False

Question 10

A population measure,such as the population mean,is called a:

Accepted Answer

A) statistic. 
B) parameter. 
C) prime number. 
D) sample value. 
A) statistic. 
B) parameter. 
C) prime number. 
D) sample value.

Question 11

A statistic is a value that describes a population characteristic while a parameter is computed from a sample.

Accepted Answer

A) True 
 B)False

Question 12

What is meant by the concept,standardizing the data? Explain why a decision maker may wish to compute a standardized value.

Accepted Answer

The concept,standardized data,refers to

Question 13

The following data reflect the number of customers who return merchandise for a refund on Monday.Note these data reflect the population of all 10 Mondays for which data are available.   Assume that this same exact pattern of data were replicated for the next ten days.How would this affect the standard deviation for the new population with 20 items?

Accepted Answer

A) The standard deviation would be doubled. 
B) The standard deviation would be cut in half. 
C) The standard deviation would not be changed. 
D) There is no way of knowing the exact impact without knowing how the mean is changed. 
A) The standard deviation would be doubled. 
B) The standard deviation would be cut in half. 
C) The standard deviation would not be changed. 
D) There is no way of knowing the exact impact without knowing how the mean is changed.

Question 14

At a sawmill in Oregon,a process improvement team measured the diameters for a sample of 1,500 logs.The following summary statistics were computed: Q1 = 8.9 in.Q2 = 13.5 in.Q3 = 15.6 in   in.
Given this information,for a box and whisker plot which of the following statements is appropriate?

Accepted Answer

A) Seventy-five percent of the trees in the sample have values between 8.9 in.and 15.6 in. 
B) Virtually all of the data should fall between 0 in.and 25.65 in. 
C) No tree will have a diameter of more than 22.3 in. 
D) Fifty percent of the trees will have diameters between 13.5 and 15.6 inches. 
A) Seventy-five percent of the trees in the sample have values between 8.9 in.and 15.6 in. 
B) Virtually all of the data should fall between 0 in.and 25.65 in. 
C) No tree will have a diameter of more than 22.3 in. 
D) Fifty percent of the trees will have diameters between 13.5 and 15.6 inches.

Question 15

The Good-Guys Car Dealership has tracked the number of used cars sold at its downtown dealership.Consider the following data as representing the population of cars sold in each of the 8 weeks that the dealership has been open.   The population standard deviation is approximately 2.87 cars.

Accepted Answer

A) True 
 B)False

Question 16

You are given the following data:   If these data were considered to be a population and you computed the mean,you would get the same answer as if these data were considered to be a sample from a larger population.

Accepted Answer

A) True 
 B)False

Question 17

A large retail company gives an employment screening test to all prospective employees.If a prospective employee receives a report saying that she scored at the 40th percentile:

Accepted Answer

A) she scored above the median. 
B) she scored better than 40 percent of people who took the test. 
C) she scored in the top 40 percent of people who took the test. 
D) her z-score was a 40. 
A) she scored above the median. 
B) she scored better than 40 percent of people who took the test. 
C) she scored in the top 40 percent of people who took the test. 
D) her z-score was a 40.

Question 18

Suppose a study of houses that have sold recently in your community showed the following frequency distribution for the number of bedrooms:   Based on this information,the mode for the data is 140.

Accepted Answer

A) True 
 B)False

Question 19

You are given the following data:   Assuming that the data reflect the population of interest,the mean of the population is 36.00.

Accepted Answer

A) True 
 B)False

Question 20

Under what circumstances is it necessary to use the coefficient of variation to compare relative variability between two or more distributions?

Accepted Answer

A) When the means of the distributions are equal 
B) When the means of the distributions are not equal 
C) When the standard deviations of the distributions are not equal 
D) When the standard deviations of the distributions are equal 
A) When the means of the distributions are equal 
B) When the means of the distributions are not equal 
C) When the standard deviations of the distributions are not equal 
D) When the standard deviations of the distributions are equal

Suppose that the distribution of grocery purchases is thought to be symmetric.If the mean purchase is $23.14,what would the median purchase be?

A store manager tracks the number of customer complaints each week.The following data reflect a random sample of ten weeks. The standard deviation for these data is approximately 27.78.

At a sawmill in Oregon,a process improvement team measured the diameters for a sample of 1,500 logs.The following summary statistics were computed: Q1 = 8.9 in.Q2 = 13.5 in.Q3 = 15.6 in in. Given this information,in a box and whisker plot,which of these four values will NOT appear?

The interquartile range is the difference between the mean and the median.

In the annual report,a major food chain stated that the distribution of daily sales at its Detroit stores is known to be bell-shaped,and that 95 percent of all daily sales fell between $19,200 and $36,400.Based on this information,what were the mean sales?

The range is an ideal measure of variation since it is not sensitive to extreme values in the data.

Consider the following data,which represent the number of miles that employees commute from home to work each day.There are two samples: one for males and one for females. Males: Females: Which of the following statements is true?

The sample mean is an estimate of μ and may be either higher or lower than μ depending on the sample.

A population measure,such as the population mean,is called a:

A statistic is a value that describes a population characteristic while a parameter is computed from a sample.

What is meant by the concept,standardizing the data? Explain why a decision maker may wish to compute a standardized value.

At a sawmill in Oregon,a process improvement team measured the diameters for a sample of 1,500 logs.The following summary statistics were computed: Q1 = 8.9 in.Q2 = 13.5 in.Q3 = 15.6 in in. Given this information,for a box and whisker plot which of the following statements is appropriate?

The Good-Guys Car Dealership has tracked the number of used cars sold at its downtown dealership.Consider the following data as representing the population of cars sold in each of the 8 weeks that the dealership has been open. The population standard deviation is approximately 2.87 cars.

You are given the following data: If these data were considered to be a population and you computed the mean,you would get the same answer as if these data were considered to be a sample from a larger population.

A large retail company gives an employment screening test to all prospective employees.If a prospective employee receives a report saying that she scored at the 40^th percentile:

Suppose a study of houses that have sold recently in your community showed the following frequency distribution for the number of bedrooms: Based on this information,the mode for the data is 140.

You are given the following data: Assuming that the data reflect the population of interest,the mean of the population is 36.00.

Under what circumstances is it necessary to use the coefficient of variation to compare relative variability between two or more distributions?

The Where, why, and How of Data Collection

Graphs,charts and Tablesdescribing Your Data

Using Probability and Probability Distributions

Discrete Probability Distributions

Introduction to Continuous Probability Distributions

Introduction to Sampling Distributions

Estimating Single Population Parameters

Introduction to Hypothesis Testing

Estimation and Hypothesis Testing for Two Population Parameters

Hypothesis Tests and Estimation for Population Variances

Analysis of Variance

Goodness-Of-Fit Tests and Contingency Analysis

Introduction to Linear Regression and Correlation Analysis

Multiple Regression Analysis and Model Building

Analyzing and Forecasting Time-Series Data

Introduction to Nonparametric Statistics

Introduction to Quality and Statistical Process Control

Introduction to Decision Analysis

Filters

Exam 3: Describing Data Using Numerical Measures

Suppose that the distribution of grocery purchases is thought to be symmetric.If the mean purchase is $23.14,what would the median purchase be?

A store manager tracks the number of customer complaints each week.The following data reflect a random sample of ten weeks. The standard deviation for these data is approximately 27.78.

At a sawmill in Oregon,a process improvement team measured the diameters for a sample of 1,500 logs.The following summary statistics were computed: Q1 = 8.9 in.Q2 = 13.5 in.Q3 = 15.6 in in. Given this information,in a box and whisker plot,which of these four values will NOT appear?

The interquartile range is the difference between the mean and the median.

In the annual report,a major food chain stated that the distribution of daily sales at its Detroit stores is known to be bell-shaped,and that 95 percent of all daily sales fell between $19,200 and $36,400.Based on this information,what were the mean sales?

The range is an ideal measure of variation since it is not sensitive to extreme values in the data.

Consider the following data,which represent the number of miles that employees commute from home to work each day.There are two samples: one for males and one for females. Males: Females: Which of the following statements is true?

The sample mean is an estimate of μ and may be either higher or lower than μ depending on the sample.

A population measure,such as the population mean,is called a:

A statistic is a value that describes a population characteristic while a parameter is computed from a sample.

What is meant by the concept,standardizing the data? Explain why a decision maker may wish to compute a standardized value.

At a sawmill in Oregon,a process improvement team measured the diameters for a sample of 1,500 logs.The following summary statistics were computed: Q1 = 8.9 in.Q2 = 13.5 in.Q3 = 15.6 in in. Given this information,for a box and whisker plot which of the following statements is appropriate?

The Good-Guys Car Dealership has tracked the number of used cars sold at its downtown dealership.Consider the following data as representing the population of cars sold in each of the 8 weeks that the dealership has been open. The population standard deviation is approximately 2.87 cars.

You are given the following data: If these data were considered to be a population and you computed the mean,you would get the same answer as if these data were considered to be a sample from a larger population.

A large retail company gives an employment screening test to all prospective employees.If a prospective employee receives a report saying that she scored at the 40th percentile:

Suppose a study of houses that have sold recently in your community showed the following frequency distribution for the number of bedrooms: Based on this information,the mode for the data is 140.

You are given the following data: Assuming that the data reflect the population of interest,the mean of the population is 36.00.

Under what circumstances is it necessary to use the coefficient of variation to compare relative variability between two or more distributions?

The Where, why, and How of Data Collection

Graphs,charts and Tablesdescribing Your Data

Using Probability and Probability Distributions

Discrete Probability Distributions

Introduction to Continuous Probability Distributions

Introduction to Sampling Distributions

Estimating Single Population Parameters

Introduction to Hypothesis Testing

Estimation and Hypothesis Testing for Two Population Parameters

Hypothesis Tests and Estimation for Population Variances

Analysis of Variance

Goodness-Of-Fit Tests and Contingency Analysis

Introduction to Linear Regression and Correlation Analysis

Multiple Regression Analysis and Model Building

Analyzing and Forecasting Time-Series Data

Introduction to Nonparametric Statistics

Introduction to Quality and Statistical Process Control

Introduction to Decision Analysis

Filters

A large retail company gives an employment screening test to all prospective employees.If a prospective employee receives a report saying that she scored at the 40^th percentile: