Question 1

The weekly salaries (in dollars)of sixteen government workers are listed below. 690 578 813 630
728 546 469 614
502 677 685 350
530 787 477 1086

Accepted Answer

A) 350,986 
B) 614 
C) 350 
D) 1086 
E) None 
A) 350,986 
B) 614 
C) 350 
D) 1086 
E) None

Question 2

In a child psychology course,children took part in an experiment to determine how,while putting together a 10-piece puzzle,being able to view the completed picture affected the time required for the child to complete the puzzle.One group (NV)was not allowed to look at the picture on the cover of the puzzle box.A second group (VP)was allowed to view the picture on the cover of the box.Below are the boxplots of the original completion times and the boxplots of the log of the completion times.     Is it better to analyze the original completion times or the log of the completion times? Explain.

Accepted Answer

Answers may vary.One possible opinion is

Question 3

Match each class with the corresponding boxplot below.

Accepted Answer

A) Class 1 is B Class 2 is C
Class 3 is A 
B) Class 1 is B Class 2 is A
Class 3 is C 
C) Class 1 is A Class 2 is B
Class 3 is C 
D) Class 1 is C Class 2 is A
Class 3 is B 
E) Class 1 is C Class 2 is B
Class 3 is A 
A) Class 1 is B Class 2 is C
Class 3 is A 
B) Class 1 is B Class 2 is A
Class 3 is C 
C) Class 1 is A Class 2 is B
Class 3 is C 
D) Class 1 is C Class 2 is A
Class 3 is B 
E) Class 1 is C Class 2 is B
Class 3 is A

Question 4

Here is a histogram of the assets (in millions of dollars)of 71 companies.The square root re-expression of assets is also given.In the square root re-expression,what does the value 45 actually indicate about the company's assets?

Accepted Answer

A) The company's assets are $45,000,000. 
B) The company's assets are $4,500,000. 
C) The company's assets are $2025. 
D) The company's assets are $2,025,000. 
E) The company's assets are $2,025,000,000. 
A) The company's assets are $45,000,000. 
B) The company's assets are $4,500,000. 
C) The company's assets are $2025. 
D) The company's assets are $2,025,000. 
E) The company's assets are $2,025,000,000.

Question 5

Here is a histogram of the assets (in millions of dollars)of 71 companies.What aspect of this distribution makes it difficult to summarize,or to discuss,the centre and spread? What could be done with these data to make it easier to discuss the distribution?

Accepted Answer

A) The distribution of assets of the 71 companies is heavily skewed to the right.The vast majority of the companies have assets represented in the first bar of the histogram,0 to 4000 dollars.This makes the discussion of the distribution meaningless.Re-expressing these data using logs or square roots might make the distribution nearly symmetric,and a meaningful discussion of centre and spread might be possible. 
B) The distribution of assets of the 71 companies is heavily skewed to the left.The vast majority of the companies have assets represented in the first bar of the histogram,0 to 4 billion dollars.This makes the discussion of the distribution meaningless.Re-expressing these data using logs or square roots might make the distribution nearly symmetric,and a meaningful discussion of centre and spread might be possible. 
C) The distribution of assets of the 71 companies is heavily skewed to the right.The vast majority of the companies have assets represented in the first bar of the histogram,0 to 4 billion dollars.This makes the discussion of the distribution meaningless.Re-expressing these data using logs or squares might make the distribution nearly symmetric,and a meaningful discussion of centre and spread might be possible. 
D) The distribution of assets of the 71 companies is heavily skewed to the right.The vast majority of the companies have assets represented in the first bar of the histogram,0 to 4000 dollars.This makes the discussion of the distribution meaningless.Re-expressing these data using logs or squares might make the distribution nearly symmetric,and a meaningful discussion of centre and spread might be possible. 
E) The distribution of assets of the 71 companies is heavily skewed to the right.The vast majority of the companies have assets represented in the first bar of the histogram,0 to 4 billion dollars.This makes the discussion of the distribution meaningless.Re-expressing these data using logs or square roots might make the distribution nearly symmetric,and a meaningful discussion of centre and spread might be possible. 
A) The distribution of assets of the 71 companies is heavily skewed to the right.The vast majority of the companies have assets represented in the first bar of the histogram,0 to 4000 dollars.This makes the discussion of the distribution meaningless.Re-expressing these data using logs or square roots might make the distribution nearly symmetric,and a meaningful discussion of centre and spread might be possible. 
B) The distribution of assets of the 71 companies is heavily skewed to the left.The vast majority of the companies have assets represented in the first bar of the histogram,0 to 4 billion dollars.This makes the discussion of the distribution meaningless.Re-expressing these data using logs or square roots might make the distribution nearly symmetric,and a meaningful discussion of centre and spread might be possible. 
C) The distribution of assets of the 71 companies is heavily skewed to the right.The vast majority of the companies have assets represented in the first bar of the histogram,0 to 4 billion dollars.This makes the discussion of the distribution meaningless.Re-expressing these data using logs or squares might make the distribution nearly symmetric,and a meaningful discussion of centre and spread might be possible. 
D) The distribution of assets of the 71 companies is heavily skewed to the right.The vast majority of the companies have assets represented in the first bar of the histogram,0 to 4000 dollars.This makes the discussion of the distribution meaningless.Re-expressing these data using logs or squares might make the distribution nearly symmetric,and a meaningful discussion of centre and spread might be possible. 
E) The distribution of assets of the 71 companies is heavily skewed to the right.The vast majority of the companies have assets represented in the first bar of the histogram,0 to 4 billion dollars.This makes the discussion of the distribution meaningless.Re-expressing these data using logs or square roots might make the distribution nearly symmetric,and a meaningful discussion of centre and spread might be possible.

Question 6

Which class had the highest median score?

Accepted Answer

A) Class 2 
B) Class 1 and class 3 
C) Class 3 
D) Class 1 
E) None,because the classes had the same median. 
A) Class 2 
B) Class 1 and class 3 
C) Class 3 
D) Class 1 
E) None,because the classes had the same median.

The weekly salaries (in dollars)of sixteen government workers are listed below. 690 578 813 630 728 546 469 614 502 677 685 350 530 787 477 1086

Match each class with the corresponding boxplot below.

Here is a histogram of the assets (in millions of dollars)of 71 companies.The square root re-expression of assets is also given.In the square root re-expression,what does the value 45 actually indicate about the company's assets?

Here is a histogram of the assets (in millions of dollars)of 71 companies.What aspect of this distribution makes it difficult to summarize,or to discuss,the centre and spread? What could be done with these data to make it easier to discuss the distribution?

Which class had the highest median score?

Stats Starts Here

Displaying and Describing Categorical Data

Displaying and Summarizing Quantitative Data

The Standard Deviation As a Ruler and the Normal Model

Scatterplots, association, and Correlation

Linear Regression

Regression Wisdom

Understanding Randomness

Sample Surveys

Experiments and Observational Studies

From Randomness to Probability

Probability Rules

Random Variables

Sampling Distribution Models

Confidence Intervals for Proportions

Testing Hypotheses About Proportions

More About Tests

Comparing Two Proportions

Inferences About Means

Comparing Means

Paired Samples and Blocks

Comparing Counts

Inferences for Regression

Analysis of Variance

Multifactor Analysis of Variance

Multiple Regression

Multiple Regression Wisdom

Rank-Based Nonparametric Tests

The Bootstrap

Filters

Exam 4: Understanding and Comparing Distributions

The weekly salaries (in dollars)of sixteen government workers are listed below. 690 578 813 630 728 546 469 614 502 677 685 350 530 787 477 1086

Match each class with the corresponding boxplot below.

Here is a histogram of the assets (in millions of dollars)of 71 companies.The square root re-expression of assets is also given.In the square root re-expression,what does the value 45 actually indicate about the company's assets?

Here is a histogram of the assets (in millions of dollars)of 71 companies.What aspect of this distribution makes it difficult to summarize,or to discuss,the centre and spread? What could be done with these data to make it easier to discuss the distribution?

Which class had the highest median score?

Stats Starts Here

Displaying and Describing Categorical Data

Displaying and Summarizing Quantitative Data

The Standard Deviation As a Ruler and the Normal Model

Scatterplots, association, and Correlation

Linear Regression

Regression Wisdom

Understanding Randomness

Sample Surveys

Experiments and Observational Studies

From Randomness to Probability

Probability Rules

Random Variables

Sampling Distribution Models

Confidence Intervals for Proportions

Testing Hypotheses About Proportions

More About Tests

Comparing Two Proportions

Inferences About Means

Comparing Means

Paired Samples and Blocks

Comparing Counts

Inferences for Regression

Analysis of Variance

Multifactor Analysis of Variance

Multiple Regression

Multiple Regression Wisdom

Rank-Based Nonparametric Tests

The Bootstrap

Filters