A Physician Claims That a Personʹs Diastolic Blood Pressure Can $$\alpha$$

Multiple Choice

A physician claims that a personʹs 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 physicianʹs claim. Use $$\alpha$$ = 0.05. $$\begin{array} { l c c c c c c c c c c } \hline \text { Patient } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 \\\hline \text { Before } & 84 & 98 & 87 & 92 & 82 & 80 & 97 & 85 & 91 & 90 \\\text { After } & 81 & 92 & 87 & 84 & 76 & 69 & 100 & 75 & 87 & 74\end{array}$$

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