April 2024
Intermediate to advanced
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English
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684 Business Statistics
18.3 MANN–WHITNEY U TEST
The Mann–Whitney U test (a counterpart of the t test) is used to compare the means of two independent
populations when the normality assumption of population is not met or when data are ordinal in nature.
This test was developed by H. B. Mann and D. R. Whitney, in 1947. The Mann–Whitney U test is based
on two assumptions. The assumptions relate to independency of samples and the ordinal nature of data.
In order to perform the Mann–Whitney U test, the sample values are combined into one group
and then these values are arranged in ascending order. These pooled values are ranked from 1 to n, the ...