1. A weight-lifting coach claims that a weight-lifter 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 E, they are tested again. The new results are listed below. Find the critical value for a Wilcoxon signed-rank test to test the claim that the vitamin E supplement is effective in increasing the athletes' strength. Use α=0.05. Athlete 1 2 3 4 5 6 7 8 9 Befor 195 201 181 188 203 230 214 260 271 After 205 206 181 186 210 245 219 255 276 A.3 B.6 C.2 D.4
1. A weight-lifting coach claims that a weight-lifter 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 E, they are tested again. The new results are listed below. Find the critical value for a Wilcoxon signed-rank test to test the claim that the vitamin E supplement is effective in increasing the athletes' strength. Use α=0.05.
|
Athlete |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
|
Befor |
195 |
201 |
181 |
188 |
203 |
230 |
214 |
260 |
271 |
|
After |
205 |
206 |
181 |
186 |
210 |
245 |
219 |
255 |
276 |
A.3
B.6
C.2
D.4
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