Suppose That We Take 15 Gay Couples and Observe the Difference

Multiple Choice

Suppose that we take 15 gay couples and observe the difference within couples in terms of age. Then we take 15 straight couples are record the same differences. We want to test if straight couples are more similar in age than gay couples. (There is some reason to expect that this is true.) What statistical procedure would be most appropriate?

A) computing a correlation coefficient for each couple
B) running an independent samples t test between gays and straights
C) running a t test for related samples
D) using a chi-square test