A medical researcher wishes to determine if a pill has the undesirable side effect of reducing the blood pressure of the user. The study involves recording the initial blood pressures of 15 college-age women. After they use the pill regularly for six months, their blood pressures are again recorded. The researcher wishes to draw inferences about the effect of the pill on blood pressure from the observations given in the following:. Blood-pressure Measurements Before and After Use of Pill
Subject 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Before(x) 70 80 72 76 76 76 72 78 82 64 74 92 74 68 84
After(y) 68 72 62 70 58 66 68 52 64 72 74 60 74 72 74
Answer the following questions
(i) first Using calculator and then
(ii) using SPss program.
(a) Calculate the 95% confidence interval for the mean reduction in blood pressure
(b) Do the data substantiate the claim that the use of pill reduces blood pressure