Statistical Analysis of the Median Test and the Mann-Whitney U Test

Statistical Analysis of the Median Test and the Mann-Whitney U Test

By Eric U. Oti*, Michael O. Olusola and Perewarebo A. Esemokumo

The median test and Mann-Whitney U test are nonparametric methods designed to handle two samples problem, their data are continuous which consist of two mutually independent random samples. They are used to test whether two (or more) independent samples have been drawn from populations with the same median. In this paper, we discussed and analyzed these two methods using the same illustrative example, testing the null hypothesis at 5 percent significance level and it was observed that both the median and Mann-Whitney U test were statistically significant indicating that the two samples of scores earned by students in Statistics department were drawn from populations with equal median scores in the course.

KEYWORDS: Chi-Square, Contingency Table, Population, Rank, Two Samples.

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