The Mann-Whitney U test is a statistical test for a variable measured on an ordinal scale,comparing the difference in the location of two populations based on observations from two independent samples.

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The explanation given in the statement is correct. The Mann-Whitney U test is a non-parametric test used to compare the medians of two independent samples, where the data are measured on an ordinal scale or have an underlying distribution that is not normal.

The Mann-Whitney U Test Is a Statistical Test for a Variable