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Unformatted text preview: 3. Now let’s perform the Mann-Whitney U test using α = 0 . 05 . Our null hypothesis will be that the formulations are equivalent, and our alternative hypothesis will be that they’re not equivalent (a two-sided alternative). (a) State the assumptions for the Mann-Whitney U test (test for median), and state whether or not they’re satisﬁed for our data. We already stated what our hypotheses were. (b) Calculate the value of the test statistic U . (For the step where you can choose either group, but here choose Formulation 1.) Our test yields a p-value of 0.2857, which is greater than α , so we fail to reject H . (c) Have we proven that the two formulations are equivalent, so that any further research into this question would be a waste of time? Why or why not? (Hint: Just think what fail to reject implies.)...
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This note was uploaded on 12/15/2011 for the course STA 3024 taught by Professor Ta during the Spring '08 term at University of Florida.
- Spring '08