Choose the one alternative that best completes the statement or answers the question.
-A football coach believes that a player can increase strength by taking vitamin E. To test the theory, the coach randomly selects 9 athletes and gives them a strength test using a bench press. The results are listed below. Thirty days later, after regular training supplemented by vitamin $\mathrm { E }$, they are tested again. The new results are listed below. Use the Wilcoxon signed-ranks test to find the critical value to test the hypothesis that the vitamin E supplement is effective in increasing the athletes' strength. Use $\alpha = 0.05$.
$\begin{array}{lccccccccc}
\text { Athlete } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 \
\hline \text { Before } & 182 & 228 & 195 & 246 & 276 & 242 & 203 & 217 & 274 \
\text { After } & 192 & 233 & 195 & 244 & 283 & 257 & 208 & 212 & 279
\end{array}$

A) 6
B) 4
C) 2
D) 3

Question

Choose the one alternative that best completes the statement or answers the question.
-A football coach believes that a player can increase strength by taking vitamin E. To test the theory, the coach randomly selects 9 athletes and gives them a strength test using a bench press. The results are listed below. Thirty days later, after regular training supplemented by vitamin $\mathrm { E }$, they are tested again. The new results are listed below. Use the Wilcoxon signed-ranks test to find the critical value to test the hypothesis that the vitamin E supplement is effective in increasing the athletes' strength. Use $\alpha = 0.05$.
$\begin{array}{lccccccccc}
\text { Athlete } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 \
\hline \text { Before } & 182 & 228 & 195 & 246 & 276 & 242 & 203 & 217 & 274 \
\text { After } & 192 & 233 & 195 & 244 & 283 & 257 & 208 & 212 & 279
\end{array}$

A) 6
B) 4
C) 2
D) 3

Quizplus · Accepted Answer

The critical value for a Wilcoxon signed-ranks test with 9 pairs of data and $\alpha = 0.05$ is 6.

Choose the One Alternative That Best Completes the Statement or Answers