A researcher wishes to test the effectiveness of two major brands of headache medicine. The subjects were given one of three treatments (Drug A, Drug B, or a Placebo) and their level of headache relief was measured on a scale (0-50). The results of the study are given below. Answer the following questions.

(d). Using the present regression model, estimate the mean level of headache relief for each

treatment.

(e). Using the regression model, estimate the difference between drug A and drug B in mean level of headache relief.