Question

High blood pressure (hypertension) is a leading cause of strokes. Medical researchers are constantly seeking ways to treat patients suffering from this condition. A specialist in hypertension claims that regular aerobic exercise can reduce high blood pressure just as successfully as drugs, with none of the adverse side effects. To test the claim, 50 patients who suffer from high blood pressure were chosen to participate in an experiment. For 60 days, half the sample exercised three times per week for 1 hourand did not take medication; the other half took the standard medication. The percentage reduction in blood pressure was recorded for each individual.Estimate with 95% confidence the difference in mean percentage reduction in blood pressure between drugs and exercise programs.

exercise	drug
10	7
14	7
12	7
13	11
14	14
15	8
15	16
10	4
7	6
13	13
15	11
12	12
14	6
14	8
15	14
13	6
14	5
15	10
19	8
11	14
13	15
13	10
17	16
15	12
15	8

Answer 1

First we need to find the descriptive statistics of data generated by excel:

Descriptive statistics
	exercise	drug
count	25	25
mean	13.52	9.92
sample standard deviation	2.40	3.63
sample variance	5.76	13.16
minimum	7	4
maximum	19	16
range	12	12

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