The main trail in Problem 7 is conducted and involves a total of 200 patients. Patients are enrolled and randomized to receive either the experimental medication or the placebo. The data show in Table 7-55 are collected at the end of the study after 6 weeks on the assigned treatment.

a.Test if there is a significant difference in mean systolic blood pressures between groups using &..;@=0.05.

b. Test if there is a significant difference in the proportions of hypertensive patients between groups using @=0.05

Table 7-55 outcomes by treatment

Experimental (n=100) Placebo(n=100), experimental Mean(SD) systolic blood pressure 120.2(15.4) Placebo 131.4(18.9)

Hypertensive(%) Experimental=14 and Placebo=22 Side Effects(%) Experimental=6 and Placebo=8