Question 1

Which statement about the correlation coefficient,r,is true?

Accepted Answer

A)  The calculation of r assumes that X and Y are metric variables whose distributions have the same shape.
B)  The correlation coefficient computed for a population is denoted by ρ(rho) .
C)  Data obtained by using rating scales with a small number of categories tends to deflate r.
D)  All of the statements are true.E) None of the above
F) A) and B)

Question 2

Which equation depicts the relationship between the standardized and non-standardized regression coefficients?

Accepted Answer

A)  Byx = byx(S2x/S2y) 
B)  B2yx = byx(Sx/Sy) 
C)  Byx = byx(Sx/Sy) 
D)  B2yx =  byx(S2x/S2y) E) B) and D)
F) A) and B)

Question 3

The ________ is a measure of the association between two variables after controlling or adjusting for the effects of one or more additional variables.

Accepted Answer

A)  regression analysis
B)  partial correlation coefficient
C)  ANOVA
D)  product moment correlationE) B) and D)
F) C) and D)

Question 4

Both r and r2 are symmetric measures of association.In other words,the correlation of X and Y is the same as the correlation of Y and X.

Accepted Answer

A) True 
 B)False

Question 5

R2 cannot decrease as more independent variables are added to the regression equation.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following is a measure of nonmetric correlation?

Accepted Answer

A)  Pearson product moment correlation
B)  Spearman's rho
C)  Kendall's tau
D)  both B and CE) A) and B)
F) None of the above

Question 7

The order associated with a partial correlation indicates how many variables are being adjusted or controlled.

Accepted Answer

A) True 
 B)False

Question 8

In bivariate regression,the null hypothesis is that no linear relationship exists between X and Y,or H0: β1 = 0.

Accepted Answer

A) True 
 B)False

Question 9

The estimated parameter b is usually referred to as the non-standardized regression coefficient.

Accepted Answer

A) True 
 B)False

Question 10

r = 0 indicates ________.

Accepted Answer

A)  X and Y have a relationship
B)  X and Y don't have a linear relationship
C)  X and Y are unrelated
D)  X and Y have a linear relationshipE) A) and B)
F) B) and C)

Question 11

If an examination of the residuals indicates that the assumptions underlying linear regression are not met,the researcher can transform the variables in an attempt to satisfy the assumptions.

Accepted Answer

A) True 
 B)False

Question 12

In the absence of ties,Kendall's τ yields a closer approximation to the Pearson product moment correlation coefficient,ρ,than Spearman's ρs.

Accepted Answer

A) True 
 B)False

Exam 17: Correlation and Regression

r = 0 indicates ________.

Correct Answer
verified

Which statement about the correlation coefficient,r,is true?

Correct Answer
verified

The estimated parameter b is usually referred to as the non-standardized regression coefficient.

Correct Answer
verified

The ________ is a measure of the association between two variables after controlling or adjusting for the effects of one or more additional variables.

Correct Answer
verified

Both r and r² are symmetric measures of association.In other words,the correlation of X and Y is the same as the correlation of Y and X.

Correct Answer
verified

Which equation depicts the relationship between the standardized and non-standardized regression coefficients?

Correct Answer
verified

In the absence of ties,Kendall's τ yields a closer approximation to the Pearson product moment correlation coefficient,ρ,than Spearman's ρ_s.

Correct Answer
verified

The order associated with a partial correlation indicates how many variables are being adjusted or controlled.

Correct Answer
verified

In bivariate regression,the null hypothesis is that no linear relationship exists between X and Y,or H₀: β₁=0.

Correct Answer
verified

Which of the following is a measure of nonmetric correlation?

Correct Answer
verified

R²cannot decrease as more independent variables are added to the regression equation.

Correct Answer
verified

If an examination of the residuals indicates that the assumptions underlying linear regression are not met,the researcher can transform the variables in an attempt to satisfy the assumptions.

Correct Answer
verified

Exam 17: Correlation and Regression

r = 0 indicates ________.

Correct AnswerverifiedShow Answer

Which statement about the correlation coefficient,r,is true?

Correct AnswerverifiedShow Answer

The estimated parameter b is usually referred to as the non-standardized regression coefficient.

Correct AnswerverifiedShow Answer

The ________ is a measure of the association between two variables after controlling or adjusting for the effects of one or more additional variables.

Correct AnswerverifiedShow Answer

Both r and r2 are symmetric measures of association.In other words,the correlation of X and Y is the same as the correlation of Y and X.

Correct AnswerverifiedShow Answer

Which equation depicts the relationship between the standardized and non-standardized regression coefficients?

Correct AnswerverifiedShow Answer

In the absence of ties,Kendall's τ yields a closer approximation to the Pearson product moment correlation coefficient,ρ,than Spearman's ρs.

Correct AnswerverifiedShow Answer

The order associated with a partial correlation indicates how many variables are being adjusted or controlled.

Correct AnswerverifiedShow Answer

In bivariate regression,the null hypothesis is that no linear relationship exists between X and Y,or H0: β1 = 0.

Correct AnswerverifiedShow Answer

Which of the following is a measure of nonmetric correlation?

Correct AnswerverifiedShow Answer

R2 cannot decrease as more independent variables are added to the regression equation.

Correct AnswerverifiedShow Answer

If an examination of the residuals indicates that the assumptions underlying linear regression are not met,the researcher can transform the variables in an attempt to satisfy the assumptions.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Both r and r² are symmetric measures of association.In other words,the correlation of X and Y is the same as the correlation of Y and X.

Correct Answer
verified

Correct Answer
verified

In the absence of ties,Kendall's τ yields a closer approximation to the Pearson product moment correlation coefficient,ρ,than Spearman's ρ_s.

Correct Answer
verified

Correct Answer
verified

In bivariate regression,the null hypothesis is that no linear relationship exists between X and Y,or H₀: β₁=0.

Correct Answer
verified

Correct Answer
verified

R²cannot decrease as more independent variables are added to the regression equation.

Correct Answer
verified

Correct Answer
verified