![]() Ordinal or Continuous: The variable you’re analyzing is ordinal or continuous.Assumptions of the Mann-Whitney U Testīefore you conduct a Mann-Whitney U test, you need to make sure the following four assumptions are met: Thus, a Mann-Whitney U test is appropriate as long as the following assumptions are met. In each example you have two groups that you want to compare, the sampling distributions are not normal, and the sample sizes are small. You want to know if the scores of 8 students in class A differ from those of 7 students in class B.The weight loss is not normally distributed. You want to know if weight loss varies for two groups: 12 people using diet A and 10 people using diet B.The salaries are not normally distributed. the salaries of five graduates from university B. You want to compare the salaries of five graduates from university A vs.Here are some examples of when you might use a Mann-Whitney U test: It is considered to be the nonparametric equivalent to the two-sample independent t-test. A Mann-Whitney U test (sometimes called the Wilcoxon rank-sum test) is used to compare the differences between two independent samples when the sample distributions are not normally distributed and the sample sizes are small (n <30).
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