Question: It is hypothesized that Democrats and Republicans differ with respect to the personality trait of “need dependence.” Random samples of 10 Republicans and 10 Democrats are selected, and each subject is given the Edward Personal Preference Schedule (EPPS). The scores on the scale for “need dependence” are as follows:

a. Identify independent and dependent variables.

b. Test the hypothesis at level .01.

c. Compute the effect size.

d. Compute confidence intervals for the mean difference.