How medication has lowered the patients blood pressure

Question

Problem: The Excel file Blood Pressure.xls shows the monthly blood pressure (diastolic) readings for a patient before and after medication.

a. Test the hypothesis that the variances of monthly blood pressure readings before and after medication are the same.

b. Conduct an appropriate hypothesis test to determine if there is evidence that the medication has lowered the patient's blood pressure.

	Monthly diastolic	0 = before medication
Month	blood pressure	1 = after medication
1	78	0
2	90	0
3	80	0
4	88	0
5	88	0
6	88	0
7	90	0
8	82	0
9	92	0
10	88	0
11	90	1
12	68	1
13	78	1
14	90	1
15	80	1
16	80	1
17	74	1
18	84	1
19	90	1
20	80	1
21	88	1
22	86	1
23	82	1
24	80	1
25	80	1
26	84	1
27	79	1
28	78	1
29	80	1
30	83	1
31	82	1
32	86	1
33	82	1
34	82	1
35	78	1
36	72	1
37	80	1
38	82	1
39	78	1
40	82	1
41	84	1