Mann-Whitney U test

Mann-Whitney U test: It is the non-parametric alternative test to the unpaired t-test. It is a non-parametric test that is used to compare two sample means that come from the same population, and used to test whether two sample means are equal or not.  Usually, the Mann-Whitney U test is used when the data is ordinal or when the assumptions of the t-test are not met.

Assumptions:

1. Sample drawn from the population is random
2. Observations are independent
3. Ordinal measurement scale

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