Question: In order to have a correlation coefficient between traits A and B, it is necessary to have: a. one group of subjects, some of whom

In order to have a correlation coefficient between traits A and B, it is necessary to have:

a. one group of subjects, some of whom possess characteristics of trait A, the remainder possessing those of trait B

b. measures of trait A on one group of subjects and of trait B on another group

c. two groups of subjects, one which could be classified as A or not A, the other as B or not B

d. two groups of subjects, one which could be classified as A or not A, the other as B or not B

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