1) The numerator of the correlation coefficient measures the extent to which two variables ______.

a) Vary at random

b) vary independently

c) covary

d. none of these

2) The point-biserial correlation coefficient is used to measure the correlation between two dichotomous variables. True or False

3) The formula for the Spearman correlation coefficient was derived from the formula for the Pearson correlation coefficient. True or False

4) The closer that data points fall to the regression line, the more closely two factors are related.

True or False

5) The denominator of the Pearson correlation coefficient measures the extent to which two factors vary together. True or False

6) The appropriate correlation coefficient for measuring for the direction and strength of the linear relationship between two dichotomous variables is ______.

a) the Spearman rank-order correlation coefficient

b) the point-biserial correlation coefficient

c) the phi correlation coefficient

d) none of the above