-Identify why you choose to perform the statistical test (Sign test, Wilcoxon test, Kruskal-Wallis test). -Identify the...

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-Identify why you choose to perform the statistical test (Signtest, Wilcoxon test, Kruskal-Wallis test).
-Identify the null hypothesis, Ho, and the alternativehypothesis, Ha.
-Determine whether the hypothesis test is left-tailed,right-tailed, or two-tailed.
-Find the critical value(s) and identify the rejectionregion(s).
-Find the appropriate standardized test statistic. Ifconvenient, use technology.
-Decide whether to reject or fail to reject the nullhypothesis.
-Interpret the decision in the context of the originalclaim.
A weight-lifting coach claims that weight-lifters can increasetheir strength by taking vitamin E. To test the theory, the coachrandomly selects 9 athletes and gives them a strength test using abench press. Thirty days later, after regular training supplementedby vitamin E, they are tested again. The results are listed below.Use the Wilcoxon signed-rank test to test the claim that thevitamin E supplement is effective in increasing athletes' strength.Use ? = 0.05.
Athlete
1
2
3
4
5
6
7
8
9
Before
185
241
251
187
216
210
204
219
183
After
195
246
251
185
223
225
209
214
188

Answer & Explanation Solved by verified expert

4.2 Ratings (540 Votes)

We will use the Wilkoxon signedrank testThe paired samples Wilcoxon test also known asWilcoxon signedrank test is anonparametric alternative to paired ttest usedto compare See Answer

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Athlete	1	2	3	4	5	6	7	8	9
Before	185	241	251	187	216	210	204	219	183
After	195	246	251	185	223	225	209	214	188