Question 1

Of those in the sample who did well in the final exam,what percentage of them spent the weekend before the exam studying?

Accepted Answer

60 out of

Question 2

It is possible that the data points are close to a curve and have a correlation close to 0,because correlation is relevant only for measuring linear relationships.

Accepted Answer

A) True 
 B)False

Question 3

The table shown below contains information technology (IT)investment as a percentage of total investment for eight countries during the 1990s.It also contains the average annual percentage change in employment during the 1990s.Explain how these data shed light on the question of whether IT investment creates or costs jobs.(Hint: Use the data to construct a scatterplot)

Accepted Answer

The scatterplot displayed below shows th

Question 4

What percentage of these internet users has formal education beyond high school?

Accepted Answer

The answer of What percentage of these internet users has...

Question 5

We must specify appropriate bins for side-by-side histograms in order to make fair comparisons of distributions by category.

Accepted Answer

A) True 
 B)False

Question 6

A sample of 30 schools produced the pivot table shown below for the average percentage of students graduating from high school.Use this table to determine how the type of school (public or Catholic)that students attend affects their chance of graduating from high school.

Accepted Answer

The percentages in the right column sugg

Question 7

Approximate the percentage of these Internet users who are single with no formal education beyond high school.

Accepted Answer

The answer of Approximate the percentage of these Internet users...

Question 8

To form a scatterplot of X versus Y,X and Y must be paired

Accepted Answer

A) True 
 B)False

Question 9

There are two scatterplots shown below.The first chart shows the relationship between the size of the home and the selling price.The second chart examines the relationship between the number of bedrooms in the home and its selling price.Which of these two variables (the size of the home or the number of bedrooms)seems to have the stronger relationship with the home's selling price? Justify your answer.

Accepted Answer

The relationship between selling price a

Question 10

If the standard deviation of X is 15,the covariance of X and Y is 94.5,the coefficient of correlation r = 0.90,then the variance of Y is 7.0.

Accepted Answer

A) True 
 B)False

Question 11

Approximate the percentage of these Internet users who are married with formal education beyond high school.

Accepted Answer

The answer of Approximate the percentage of these Internet users...

Question 12

How would you characterize the relationship between gender and annual salary?

Accepted Answer

It is a somewhat weak relationship at -0

Question 13

Of those in the sample who went partying the weekend before the final exam,what percentage of them did well in the exam?

Accepted Answer

22 out of

Question 14

Which of the variables have essentially no linear relationship with the household's average monthly expenditure on utilities?

Accepted Answer

It appears that fami

Question 15

If the coefficient of correlation r = 0 .80,the standard deviations of X and Y are 20 and 25,respectively,then Cov(X,Y)must be 400.

Accepted Answer

A) True 
 B)False

Question 16

Which of the variables have a positive linear relationship with the household's average monthly expenditure on utilities?

Accepted Answer

Ownership has a strong positive linear r

Question 17

A useful way of comparing the distribution of a numerical variable across categories of some categorical variable is

Accepted Answer

A) Side-by-side boxplots 
B) Side-by-side histograms 
C) Both of these options 
D) Neither of these options 
A) Side-by-side boxplots 
B) Side-by-side histograms 
C) Both of these options 
D) Neither of these options

Question 18

Tables used to display counts of a categorical variable are called

Accepted Answer

A) Crosstabs 
B) Contingency tables 
C) Both of these options 
D) Neither of these options 
A) Crosstabs 
B) Contingency tables 
C) Both of these options 
D) Neither of these options

Question 19

Which two variables have the strongest linear relationship with annual salary?

Accepted Answer

Age at 0.923 and Gamma experie

Question 20

The tool that provides useful information about a data set by breaking it down into subpopulations is the:

Accepted Answer

A) histogram 
B) scatterplot 
C) pivot table 
D) spreadsheet 
A) histogram 
B) scatterplot 
C) pivot table 
D) spreadsheet

Of those in the sample who did well in the final exam,what percentage of them spent the weekend before the exam studying?

It is possible that the data points are close to a curve and have a correlation close to 0,because correlation is relevant only for measuring linear relationships.

What percentage of these internet users has formal education beyond high school?

We must specify appropriate bins for side-by-side histograms in order to make fair comparisons of distributions by category.

A sample of 30 schools produced the pivot table shown below for the average percentage of students graduating from high school.Use this table to determine how the type of school (public or Catholic)that students attend affects their chance of graduating from high school.

Approximate the percentage of these Internet users who are single with no formal education beyond high school.

To form a scatterplot of X versus Y,X and Y must be paired

If the standard deviation of X is 15,the covariance of X and Y is 94.5,the coefficient of correlation r = 0.90,then the variance of Y is 7.0.

Approximate the percentage of these Internet users who are married with formal education beyond high school.

How would you characterize the relationship between gender and annual salary?

Of those in the sample who went partying the weekend before the final exam,what percentage of them did well in the exam?

Which of the variables have essentially no linear relationship with the household's average monthly expenditure on utilities?

If the coefficient of correlation r = 0 .80,the standard deviations of X and Y are 20 and 25,respectively,then Cov(X,Y)must be 400.

Which of the variables have a positive linear relationship with the household's average monthly expenditure on utilities?

A useful way of comparing the distribution of a numerical variable across categories of some categorical variable is

Tables used to display counts of a categorical variable are called

Which two variables have the strongest linear relationship with annual salary?

The tool that provides useful information about a data set by breaking it down into subpopulations is the:

Introduction to Data Analysis and Decision Making

Describing the Distribution of a Single Variable

Probability and Probability Distributions

Normal, binomial, poisson, and Exponential Distributions

Decision Making Under Uncertainty

Sampling and Sampling Distributions

Confidence Interval Estimation

Hypothesis Testing

Regression Analysis: Estimating Relationships

Regression Analysis: Statistical Inference

Time Series Analysis and Forecasting

Introduction to Optimization Modeling

Optimization Modeling: Applications

Introduction to Simulation Modeling

Simulation Models

Filters

Exam 3: Finding Relationships Among Variables

Of those in the sample who did well in the final exam,what percentage of them spent the weekend before the exam studying?

It is possible that the data points are close to a curve and have a correlation close to 0,because correlation is relevant only for measuring linear relationships.

What percentage of these internet users has formal education beyond high school?

We must specify appropriate bins for side-by-side histograms in order to make fair comparisons of distributions by category.

A sample of 30 schools produced the pivot table shown below for the average percentage of students graduating from high school.Use this table to determine how the type of school (public or Catholic)that students attend affects their chance of graduating from high school.

Approximate the percentage of these Internet users who are single with no formal education beyond high school.

To form a scatterplot of X versus Y,X and Y must be paired

If the standard deviation of X is 15,the covariance of X and Y is 94.5,the coefficient of correlation r = 0.90,then the variance of Y is 7.0.

Approximate the percentage of these Internet users who are married with formal education beyond high school.

How would you characterize the relationship between gender and annual salary?

Of those in the sample who went partying the weekend before the final exam,what percentage of them did well in the exam?

Which of the variables have essentially no linear relationship with the household's average monthly expenditure on utilities?

If the coefficient of correlation r = 0 .80,the standard deviations of X and Y are 20 and 25,respectively,then Cov(X,Y)must be 400.

Which of the variables have a positive linear relationship with the household's average monthly expenditure on utilities?

A useful way of comparing the distribution of a numerical variable across categories of some categorical variable is

Tables used to display counts of a categorical variable are called

Which two variables have the strongest linear relationship with annual salary?

The tool that provides useful information about a data set by breaking it down into subpopulations is the:

Introduction to Data Analysis and Decision Making

Describing the Distribution of a Single Variable

Probability and Probability Distributions

Normal, binomial, poisson, and Exponential Distributions

Decision Making Under Uncertainty

Sampling and Sampling Distributions

Confidence Interval Estimation

Hypothesis Testing

Regression Analysis: Estimating Relationships

Regression Analysis: Statistical Inference

Time Series Analysis and Forecasting

Introduction to Optimization Modeling

Optimization Modeling: Applications

Introduction to Simulation Modeling

Simulation Models

Filters