In a study of heart surgery, one issue was the effect of drugs called beta-blockers on the pulse rate of patients during surgery. The available subjects were divided at random into two groups of 30 patients each. One group received a beta-blocker; the other, a placebo. The pulse rate of each patient at a critical point during the operation was recorded. The treatment group had a mean 65.2 and a standard deviation of 7.8. For the control group, the mean was 70.3 and the standard deviation was 8.3.
Do beta-blockers reduce the pulse rate ? State the hypotheses and do a t-test. Use α = 0.05