In short, the Mann‐Whitney U statistical test is an
excellent alternative to parametric tests like the t‐test, when
the assumptions of these last ones cannot be respected. With
a statistical power similar to the t‐test, the Mann‐Whitney U
is, by excellence, the test of replacement. However, as one
understood, it is more reliable to use the t‐test if its
postulates can be met.
In short, the Mann‐Whitney U statistical test is an excellent alternative to parametric tests like the t‐test, when the assumptions of these last ones cannot be respected. With a statistical power similar to the t‐test, the Mann‐Whitney U is, by excellence, the test of replacement. However, as one understood, it is more reliable to use the t‐test if its postulates can be met.
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