Question

9. A physician claims that a person's diastolic blood pressure can be lowered, if, instead of taking a drug, the person listens to a relaxation tape each evening. Ten subjects are randomly selected. Their blood pressures, measured in millimeters of mercury, are listed below. The 10 patients are given the tapes and told to listen to them each evening for one month. At the end of the month, their blood pressures are taken again. The data are listed below. Find the critical value for a Wilcoxon signed-rank test to test the physician's claim. Use α = 0.05.

Patient	1	2	3	4	5	6	7	8	9	10
Before	98	83	92	99	81	87	97	84	82	94
After	95	77	92	91	75	76	100	74	78	78

A) 8
B) 2
C) 4
D) 6

Answer 1

I Think this will clear all your doubt .
If not pleas feel free to comment

Two-Tailed Test a=.05 a=.01 One-Tailed Test a=.05a =.01 luw 32 37 43 49 69 76 84 92 116 101 126 110 30137109151120 130 100 140

here N=10 and α= 0.05 and this is a two sided test to Critical value would be

Option A) 8