Non Parametric Test : Wilcoxon Rank-Sum Test
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The following observations were randomly selected from populations that are not necessarily normally distributed. Use the .5 significance level, a two-tailed test, and the Wilcoxon rank-sum test to determine whether there is a difference between the two populations.
Population A: 12,14,15,19,23,29,33,40,51
Population B: 13,16,19,21,22,33,35,43
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Solution Summary
The solution gives the details of the non parametric test Wilcoxon rank-sum test. Step by step procedure are given with interpretations.
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Wilcoxon rank-sum test
The hypotheses are
H0: 1 = 2 versus H1: 1 ≠ 2 , where is the population median.
Rejection criteria: If the calculated value of test statistics is greater than the critical value
An assumption for the ...
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