The null and aternative hypotheses for the Wilcoxon rank sun test/Mann-Whitney U test are identical to those for the independent groups t test,except that they are stated in terms of the mean ranks.

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The null hypothesis for both tests states that there is no difference between the groups, while the alternative hypothesis states that there is a difference. However, the Wilcoxon/Mann-Whitney test uses mean ranks instead of means.

The Null and Aternative Hypotheses for the Wilcoxon Rank Sun