Question 1

A student recently wrote an entrance exam and was informed that his score placed him at the 80th percentile. This indicates that

Accepted Answer

A)  80 students who also took the exam scored below him. 
B)  he scored as high or higher than 80 percent of all those who wrote the exam. 
C)  he was in the bottom 20 percent of those who wrote the exam. 
D)  his z score was 80. 
E)  his exam mark was 80 out of 100. 
A)  80 students who also took the exam scored below him. 
B)  he scored as high or higher than 80 percent of all those who wrote the exam. 
C)  he was in the bottom 20 percent of those who wrote the exam. 
D)  his z score was 80. 
E)  his exam mark was 80 out of 100.

Question 2

Sample data were collected on the number of hours per day students spent at the computer.   Which one of the following statements is true?

Accepted Answer

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

Question 3

Below is the five number summary of the hourly wages ($) for advertising / promotion managers.
   a. Would you expect the mean salary for this sample of marketing managers to be higher or lower than the median? Explain.
b. Which would be a more appropriate measure of central tendency for these data, the mean or median? Explain.
c. Calculate the range.
d. Calculate the IQR.

Accepted Answer

a. We would expect the mean salary to be

Question 4

Consider the following to answer the question(s) below:
Below is a histogram and the five number salary for salaries (in $) for a sample of marketing managers.    
-The most appropriate measure of central tendency for these data is the

Accepted Answer

A)  median 
B)  mean 
C)  mode 
D)  range 
E)  standard deviation 
A)  median 
B)  mean 
C)  mode 
D)  range 
E)  standard deviation

Question 5

If a distribution for a quantitative variable is thought to be nearly symmetric with very little variation, and a boxplot is created for this distribution, which of the following is true?

Accepted Answer

A)  The box will be quite wide but the whiskers will be very short. 
B)  The whiskers will be about half as long as the box is wide. 
C)  There will be no whiskers. 
D)  The lower whisker will be the same length as the upper whisker. 
E)  The left and right-hand edges of the box will be approximately equal distance from the median. 
A)  The box will be quite wide but the whiskers will be very short. 
B)  The whiskers will be about half as long as the box is wide. 
C)  There will be no whiskers. 
D)  The lower whisker will be the same length as the upper whisker. 
E)  The left and right-hand edges of the box will be approximately equal distance from the median.

Question 6

The table below shows data on total assets ($ million) for a sample of a bank's branches. Prepare a stem and leaf display. Comment on the shape of the distribution.

Accepted Answer

Stem-and-Leaf Displa

Question 7

The asking price for homes in the Winnipeg real estate market has a mean value of $286,455 and a standard deviation of $11,200. The mean and standard deviation in asking price for homes in Moncton are $188,468 and $8,230, respectively. Recently, one home sold in each city where the asking price for each home was $225,000. Based on these data, which of the following statements is true?

Accepted Answer

A)  The coefficient of variation for Winnipeg is more than that for Moncton. 
B)  The Moncton home has a standardized value that is relatively closer to zero. 
C)  The coefficient of variation is the same for both cities. 
D)  The Winnipeg home has a standardized value that is relatively closer to zero. 
E)  Both homes have the same z-score. 
A)  The coefficient of variation for Winnipeg is more than that for Moncton. 
B)  The Moncton home has a standardized value that is relatively closer to zero. 
C)  The coefficient of variation is the same for both cities. 
D)  The Winnipeg home has a standardized value that is relatively closer to zero. 
E)  Both homes have the same z-score.

Question 8

Consider the following to answer the question(s) below:
Below is a histogram and the five number salary for salaries (in $) for a sample of marketing managers.    
-The IQR for these data is

Accepted Answer

A)  $83,060 
B)  $22,057 
C)  $69,693 
D)  $77,020 
E)  $14,566 
A)  $83,060 
B)  $22,057 
C)  $69,693 
D)  $77,020 
E)  $14,566

Question 9

Consider the following to answer the question(s) below:
Below is a histogram and the five number salary for salaries (in $) for a sample of marketing managers.    
-The upper and lower "fences" for a boxplot of these data are

Accepted Answer

A)  $47,636 and $113,807 
B)  $43,934.5 and $110,105.5 
C)  $54,963 and $99,077 
D)  $36,607.5 and $124,835.5 
E)  $58,664.5 and $102,778.5 
A)  $47,636 and $113,807 
B)  $43,934.5 and $110,105.5 
C)  $54,963 and $99,077 
D)  $36,607.5 and $124,835.5 
E)  $58,664.5 and $102,778.5

Question 10

Consider the following to answer the question(s) below:
Below is a histogram and the five number salary for salaries (in $) for a sample of marketing managers.    
-Suppose the marketing manager who was earning $129,420 got a raise and is now earning $140,000. Which one of the following statements is true?

Accepted Answer

A)  The mean would increase. 
B)  The median would increase. 
C)  The range would stay the same. 
D)  The IQR would increase. 
E)  The IQR would decrease. 
A)  The mean would increase. 
B)  The median would increase. 
C)  The range would stay the same. 
D)  The IQR would increase. 
E)  The IQR would decrease.

Question 11

Consider the following to answer the question(s) below:
The boxplots below show monthly sales revenue figures ($ thousands) for a discount office supply company with locations in three different regions of Canada. (Atlantic, Central and West).  
-Which of the following statements is true?

Accepted Answer

A)  The Central region has the lowest sales revenues. 
B)  The Central region has the lowest median sales revenue. 
C)  The West has the lowest mean sales revenue. 
D)  The West has the lowest median sales revenue. 
E)  The Atlantic region has the lowest mean sales. 
A)  The Central region has the lowest sales revenues. 
B)  The Central region has the lowest median sales revenue. 
C)  The West has the lowest mean sales revenue. 
D)  The West has the lowest median sales revenue. 
E)  The Atlantic region has the lowest mean sales.

Question 12

The boxplots below show the closing share prices for a sample of companies on the first trading days in August 2007 and in August 2002.   a. For which day was the median closing share price higher?
b. For which day were the closing share prices more variable? Explain.
c. Which distribution is more symmetric? Explain.

Accepted Answer

a. Aug. 2007
b. Aug. 2007; the

A student recently wrote an entrance exam and was informed that his score placed him at the 80th percentile. This indicates that

Sample data were collected on the number of hours per day students spent at the computer. Which one of the following statements is true?

Consider the following to answer the question(s) below: Below is a histogram and the five number salary for salaries (in $) for a sample of marketing managers. -The most appropriate measure of central tendency for these data is the

If a distribution for a quantitative variable is thought to be nearly symmetric with very little variation, and a boxplot is created for this distribution, which of the following is true?

The table below shows data on total assets ($ million) for a sample of a bank's branches. Prepare a stem and leaf display. Comment on the shape of the distribution.

Consider the following to answer the question(s) below: Below is a histogram and the five number salary for salaries (in $) for a sample of marketing managers. -The IQR for these data is

Consider the following to answer the question(s) below: Below is a histogram and the five number salary for salaries (in $) for a sample of marketing managers. -The upper and lower "fences" for a boxplot of these data are

Consider the following to answer the question(s) below: The boxplots below show monthly sales revenue figures ($ thousands) for a discount office supply company with locations in three different regions of Canada. (Atlantic, Central and West). -Which of the following statements is true?

Data

Surveys and Sampling

Displaying and Describing Categorical Data

Scatterplots, Association, and Correlation

Introduction to Linear Regression

Randomness and Probability

Random Variables and Probability Distributions

Sampling Distributions

Confidence Intervals for Proportions

Testing Hypotheses About Proportions

Confidence Intervals and Hypothesis Tests for Means

Comparing Two Means

Design of Experiments and Analysis of Variance Anova

Inference for Counts: Chi-Square Tests

Nonparametric Methods

Inference for Regression

Understanding Regression Residuals

Multiple Regression

Building Multiple Regression Models

Time Series Analysis

Decision Making and Risk

Quality Control

Exploring and Collecting Data

Understanding Probability Distributions and Statistical Inference

Exploring Relationships Among Variables

Using Statistics for Decision Making

Filters

Exam 5: Displaying and Describing Quantitative Data

A student recently wrote an entrance exam and was informed that his score placed him at the 80th percentile. This indicates that

Sample data were collected on the number of hours per day students spent at the computer. Which one of the following statements is true?

Consider the following to answer the question(s) below: Below is a histogram and the five number salary for salaries (in $) for a sample of marketing managers. -The most appropriate measure of central tendency for these data is the

If a distribution for a quantitative variable is thought to be nearly symmetric with very little variation, and a boxplot is created for this distribution, which of the following is true?

The table below shows data on total assets ($ million) for a sample of a bank's branches. Prepare a stem and leaf display. Comment on the shape of the distribution.

Consider the following to answer the question(s) below: Below is a histogram and the five number salary for salaries (in $) for a sample of marketing managers. -The IQR for these data is

Consider the following to answer the question(s) below: Below is a histogram and the five number salary for salaries (in $) for a sample of marketing managers. -The upper and lower "fences" for a boxplot of these data are

Consider the following to answer the question(s) below: The boxplots below show monthly sales revenue figures ($ thousands) for a discount office supply company with locations in three different regions of Canada. (Atlantic, Central and West). -Which of the following statements is true?

Data

Surveys and Sampling

Displaying and Describing Categorical Data

Scatterplots, Association, and Correlation

Introduction to Linear Regression

Randomness and Probability

Random Variables and Probability Distributions

Sampling Distributions

Confidence Intervals for Proportions

Testing Hypotheses About Proportions

Confidence Intervals and Hypothesis Tests for Means

Comparing Two Means

Design of Experiments and Analysis of Variance Anova

Inference for Counts: Chi-Square Tests

Nonparametric Methods

Inference for Regression

Understanding Regression Residuals

Multiple Regression

Building Multiple Regression Models

Time Series Analysis

Decision Making and Risk

Quality Control

Exploring and Collecting Data

Understanding Probability Distributions and Statistical Inference

Exploring Relationships Among Variables

Using Statistics for Decision Making

Filters