Exam 3: Finding Relationships Among Variables

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Displaying all correlations between 0.6 and 0.999 on a scatterplot as green and all correlations between -1.0 and -0.6 as red is known as _____ formatting.

(Multiple Choice)

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Question 21

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

(Multiple Choice)

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Question 22

Counts for a categorical variable are often expressed as percentages of the total.

(True/False)

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Question 23

Correlation and covariance can be used to examine relationships between numeric variables as well as for categorical variables that have been coded numerically.

(True/False)

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Question 24

A line or curve superimposed on a scatterplot to quantify an apparent relationship is known as a(n)

(Multiple Choice)

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Question 25

To examine relationships between two categorical variables,we can use

(Multiple Choice)

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Question 26

An example of a joint category of two variables is the count of all non-drinkers who are also nonsmokers.

(True/False)

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Question 27

Correlation is a single-number summary of a scatterplot.

(True/False)

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Question 28

The correlation between two variables is unitless and always between -1 and +1.

(True/False)

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Question 29

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

(Short Answer)

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Question 30

Relationships between two variables are less evident when counts are expressed as percentages of row totals or column totals.

(True/False)

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Question 31

The most common data format is

(Multiple Choice)

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Question 32

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.

(True/False)

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Question 33

What does a scatterplot illustrate?

(Multiple Choice)

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Question 34

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

(Short Answer)

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Question 35

Comparing a numerical variable across two or more subpopulations is known as a comparison problem.

(True/False)

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Question 36

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

(True/False)

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Question 37

Tables used to display counts of a categorical variable are called

(Multiple Choice)

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Question 38

Approximate the percentage of these Internet users who are married.

(Short Answer)

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Question 39

Strongly related variables may have a correlation close to zero if the relationship is nonlinear.

(True/False)

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Question 40

Showing 21 - 40 of 56

Displaying all correlations between 0.6 and 0.999 on a scatterplot as green and all correlations between -1.0 and -0.6 as red is known as _____ formatting.

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

Counts for a categorical variable are often expressed as percentages of the total.

Correlation and covariance can be used to examine relationships between numeric variables as well as for categorical variables that have been coded numerically.

A line or curve superimposed on a scatterplot to quantify an apparent relationship is known as a(n)

To examine relationships between two categorical variables,we can use

An example of a joint category of two variables is the count of all non-drinkers who are also nonsmokers.

Correlation is a single-number summary of a scatterplot.

The correlation between two variables is unitless and always between -1 and +1.

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

Relationships between two variables are less evident when counts are expressed as percentages of row totals or column totals.

The most common data format is

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.

What does a scatterplot illustrate?

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

Comparing a numerical variable across two or more subpopulations is known as a comparison problem.

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

Tables used to display counts of a categorical variable are called

Approximate the percentage of these Internet users who are married.

Strongly related variables may have a correlation close to zero if the relationship is nonlinear.

Introduction to Business Analytics

Describing the Distribution of a Variable

Business Intelligence Bifor Data Analysis

Probability and Probability 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 Models

Introduction to Simulation Modeling

Simulation Models

Data Mining

Analysis of Variance and Experimental Design

Statistical Process Control

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