The Kruskal-Wallis test requires that the scale of measurement of the data must be at least interval or ratio,and the samples are assumed to be randomly selected from their respective populations.

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The Kruskal-Wallis test is a non-parametric test that does not require the data to be at least interval or ratio; it can be used with ordinal data. However, it does assume that samples are randomly selected.

The Kruskal-Wallis Test Requires That the Scale of Measurement of the Data