One wishes to investigate the hypothesis that exercise reduces systolic blood pressure. A 100 person sample from a particular sedentary population indicates that μ = 120 mm Hg with a standard deviation of 8.7 mm Hg. A sample of 33 members of the local running club have a mean systolic pressure of 113 mm Hg and a standard deviation of 9.2 mm Hg.

a. State Ha c. What do you conclude at alpha = .01?
b. State Ho