Question 1

The value of correlation over covariance is that correlation ______.

Accepted Answer

A)  better describes linear relationships 
B)  better describes curvilinear relationships 
C)  can be used to compare across relationships with dissimilar variables 
D)  none of these 
A)  better describes linear relationships 
B)  better describes curvilinear relationships 
C)  can be used to compare across relationships with dissimilar variables 
D)  none of these

Question 2

Correlation is not the same as causation. Why not?

Accepted Answer

Even if two variables are related, there

Question 3

Which of the following is a valid null hypothesis to test a correlation?

Accepted Answer

A)  H1: F1F1F1S1F1F1F10 = 0 
B)  H1: F1F1F1S1F1F1F10 = 0 
C)  H1: F1F1F1S1F1F1F10 = 0 
D)  H1: F1F1F1S1F1F1F10 = 0 
A)  H1: F1F1F1S1F1F1F10 = 0 
B)  H1: F1F1F1S1F1F1F10 = 0 
C)  H1: F1F1F1S1F1F1F10 = 0 
D)  H1: F1F1F1S1F1F1F10 = 0

Question 4

Which of these is a name for r?

Accepted Answer

A)  correlation coefficient 
B)  Pearson's r 
C)  Pearson's product-moment correlation coefficient 
D)  all of these 
A)  correlation coefficient 
B)  Pearson's r 
C)  Pearson's product-moment correlation coefficient 
D)  all of these

Question 5

The conduct a significance test on a correlation, we must ______.

Accepted Answer

A)  consult an r-table 
B)  convert the correlation to t and consult a t-table 
C)  convert the correlation to z and consult a z-table 
D)  none of these 
A)  consult an r-table 
B)  convert the correlation to t and consult a t-table 
C)  convert the correlation to z and consult a z-table 
D)  none of these

Question 6

The Director of Training at our organization wants to provide training to all salespeople across all branches of our organization. If we regressed training scores on instructor quality, ______ would be our x variable, and ______ would be our y variable.

Accepted Answer

A)  Instructor quality, training scores 
B)  training scores, branch 
C)  branch, training scores 
D)  training scores, instructor quality 
A)  Instructor quality, training scores 
B)  training scores, branch 
C)  branch, training scores 
D)  training scores, instructor quality

Question 7

Causation can only be determined by experimental design - not statistics alone.

Accepted Answer

A) True 
 B)False

Question 8

What is the critical value for a correlation where n = 14?

Accepted Answer

A)  t = ±2.160 
B)  t = ±2.179 
C)  r = ±2.160 
D)  r = ±2.179 
A)  t = ±2.160 
B)  t = ±2.179 
C)  r = ±2.160 
D)  r = ±2.179

Question 9

The coefficient of determination is found to be .81. What is the value of r?

Accepted Answer

A)  .81 
B)  .09 
C)  .90 
D)  none of these 
A)  .81 
B)  .09 
C)  .90 
D)  none of these

Question 10

Correlation can be tested for statistical significance by converting it to a t-statistic and testing it against a t-distribution with (n - 1) degrees of freedom.

Accepted Answer

A) True 
 B)False

Question 11

When predicting values using a regression line, why can't we use values outside the range of the original x-variable?

Accepted Answer

The regression analysis is only able to

Question 12

When employees are very relaxed (not at all stressed), they perform poorly. When employees are concerned about meeting deadlines (somewhat stressed), they perform strongly. When employees are overwhelmed (very stressed), they perform poorly. The relationship between stress and performance can be described as ______.

Accepted Answer

A)  positive 
B)  negative 
C)  linear 
D)  curvilinear 
A)  positive 
B)  negative 
C)  linear 
D)  curvilinear

Question 13

Correlation is similar to the χ2 test of independence in that ______.

Accepted Answer

A)  both require interval or ratio level measurement 
B)  both examine the relationship between two variables 
C)  both are non-parametric tests 
D)  all of these 
A)  both require interval or ratio level measurement 
B)  both examine the relationship between two variables 
C)  both are non-parametric tests 
D)  all of these

Question 14

If r = -.8, adding a case that is high on x and high on y will result in a stronger correlation.

Accepted Answer

A) True 
 B)False

Question 15

A correlation of -1 could be described as ______.

Accepted Answer

A)  perfect relationship 
B)  imperfect relationship 
C)  null relationship 
D)  none of these 
A)  perfect relationship 
B)  imperfect relationship 
C)  null relationship 
D)  none of these

Question 16

In regression, the slope can be determined by dividing the rise by the run of the regression line.

Accepted Answer

A) True 
 B)False

Question 17

In regression, the predictor is also called the dependent variable and the criterion is also called the independent variable.

Accepted Answer

A) True 
 B)False

Question 18

As compensation increases, turnover decreases. This describes ______.

Accepted Answer

A)  no relationship 
B)  a positive relationship 
C)  a negative relationship 
D)  a perfect relationship 
A)  no relationship 
B)  a positive relationship 
C)  a negative relationship 
D)  a perfect relationship

Question 19

We have conducted a regression discovering that y′ = 12x - 10. If the predictor is valued at 1, the value of the criterion is predicted to be ______.

Accepted Answer

A)  2 
B)  0.92 
C)  1 
D)  none of these 
A)  2 
B)  0.92 
C)  1 
D)  none of these

Question 20

A correlation is a ______ covariance.

Accepted Answer

A)  curvilinear 
B)  standardized 
C)  linear 
D)  none of these 
A)  curvilinear 
B)  standardized 
C)  linear 
D)  none of these

The value of correlation over covariance is that correlation ______.

Correlation is not the same as causation. Why not?

Which of the following is a valid null hypothesis to test a correlation?

Which of these is a name for r?

The conduct a significance test on a correlation, we must ______.

The Director of Training at our organization wants to provide training to all salespeople across all branches of our organization. If we regressed training scores on instructor quality, would be our x variable, and would be our y variable.

Causation can only be determined by experimental design - not statistics alone.

What is the critical value for a correlation where n = 14?

The coefficient of determination is found to be .81. What is the value of r?

Correlation can be tested for statistical significance by converting it to a t-statistic and testing it against a t-distribution with (n - 1) degrees of freedom.

When predicting values using a regression line, why can't we use values outside the range of the original x-variable?

Correlation is similar to the χ² test of independence in that ______.

If r = -.8, adding a case that is high on x and high on y will result in a stronger correlation.

A correlation of -1 could be described as ______.

In regression, the slope can be determined by dividing the rise by the run of the regression line.

In regression, the predictor is also called the dependent variable and the criterion is also called the independent variable.

As compensation increases, turnover decreases. This describes ______.

We have conducted a regression discovering that y′ = 12x - 10. If the predictor is valued at 1, the value of the criterion is predicted to be ______.

A correlation is a ______ covariance.

The Language of Statistics

Working With Numbers and Data Display

Central Tendency and Variability

Probability Distributions

Sampling Distributions

Estimation and Confidence Intervals

Hypothesis Testing

Tests for Significance: Z-Tests and One-Sample T-Tests

Tests for Significance: Paired and Independent-Samples T-Test

Analysis of Variance Anova

CHI-Squared Tests of Fit

Matching Statistical Tests to Business Problems

Filters

Exam 12: Correlation R and Regression Y BX A

The value of correlation over covariance is that correlation ______.

Correlation is not the same as causation. Why not?

Which of the following is a valid null hypothesis to test a correlation?

Which of these is a name for r?

The conduct a significance test on a correlation, we must ______.

The Director of Training at our organization wants to provide training to all salespeople across all branches of our organization. If we regressed training scores on instructor quality, ______ would be our x variable, and ______ would be our y variable.

Causation can only be determined by experimental design - not statistics alone.

What is the critical value for a correlation where n = 14?

The coefficient of determination is found to be .81. What is the value of r?

Correlation can be tested for statistical significance by converting it to a t-statistic and testing it against a t-distribution with (n - 1) degrees of freedom.

When predicting values using a regression line, why can't we use values outside the range of the original x-variable?

Correlation is similar to the χ2 test of independence in that ______.

If r = -.8, adding a case that is high on x and high on y will result in a stronger correlation.

A correlation of -1 could be described as ______.

In regression, the slope can be determined by dividing the rise by the run of the regression line.

In regression, the predictor is also called the dependent variable and the criterion is also called the independent variable.

As compensation increases, turnover decreases. This describes ______.

We have conducted a regression discovering that y′ = 12x - 10. If the predictor is valued at 1, the value of the criterion is predicted to be ______.

A correlation is a ______ covariance.

The Language of Statistics

Working With Numbers and Data Display

Central Tendency and Variability

Probability Distributions

Sampling Distributions

Estimation and Confidence Intervals

Hypothesis Testing

Tests for Significance: Z-Tests and One-Sample T-Tests

Tests for Significance: Paired and Independent-Samples T-Test

Analysis of Variance Anova

CHI-Squared Tests of Fit

Matching Statistical Tests to Business Problems

Filters

The Director of Training at our organization wants to provide training to all salespeople across all branches of our organization. If we regressed training scores on instructor quality, would be our x variable, and would be our y variable.

Correlation is similar to the χ² test of independence in that ______.