In order to compute 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.
c. one group of subjects, some of whom have both A and B, some have neither, and some have one but not the other.
d. two groups of subjects, one which could be classified as A or not A, the other as B or not B.
e. measure of traits A and B on each subject in one group.
Question 2
Which of the following is a bivariate distribution?
a. Incomes of Denver teachers
b. Reading test scores of 50 children taught by the phonics method
c. Nursing license examination results for only male candidates
d. Home-economics aptitude test scores of this year's freshmen
e. Number of arrests made and years of experience of San Francisco policemen
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