Aresearcher is interested in the possible intercorrelations among three of the subtest scores on the Wechsler Adult Intelligence Scale (WAIS). Arandom sample of 10 inmates from a Federal Prison were selected: They were given the Comprehension subtest (a test of social intelligence), the Digit Span (a test of short-term memory) subtest, and the Information subtest (a test of general knowledge). Their weighted scaled scores were as follows:

Subject Information Digit Span Comprehension 1. 9 10 11 2. 6 5 8 3. 10 11 13 4. 7 8 6 5. 10 9 10 6. 5 5 6 7. 9 8 11 8. 10 8 9 9. 11 8 10 10. 5 8 6

a. What is the correlation between Digit Span and Information?

b. What is the correlation between Digit Span and Comprehension?

c. What is the correlation between Information and Comprehension?

d. What is the multiple correlation for predicting Comprehension from both Digit Span and Information?