The data set listed in the following table contains information on AGE, SEX (1 = male, 2 = female), work problems index (WP), marital conflict index (MC), and depression index (DEP) for a sample of 39 new admissions to a psychiatric clinic at a large university hospital. For each sex separately, determine (using α = .10) the best regression model relating DEP to MC and WP, controlling for AGE, using the following sequential procedure: (1) force AGE into the model first; (2) use the all possible regressions approach on the remaining two independent variables WP and MC; (3) determine whether the interaction term (MC × WP) should be added to the model. Compare and discuss the results obtained for each sex.

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