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1. It is well known that similarity in attitudes, beliefs and interests plays an important role in interpersonal attraction.Thus, correlations for attitudes between married couples should be strong. Suppose a researcher developed a questionnaire that measures how liberal or conservative one’s attitudes are. Low scores indicate that the person has liberal attitudes, whereas high scores indicate conservatism. The following hypothetical data are scores from married couples.

Couple Wife Husband

A 11 14

B 6 7

C 16 15

D 4 7

E 1 3

F 10 9

G 5 9

H 3 8

Compute the Pearson correlation for these data, and determine whether there is a significant correlation between attitudes for husbands and wives. Set alpha at 0.05, two tails.

2. Assuming a two-tailed test with a=.05, how large a correlation is needed to be statistically significant for each of the following samples?

a. A sample of n=10

b. A sample of n=20

c. A sample of n=30

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