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Kruskal-Wallis test assumptions

Which is not an assumption of the Kruskal-Wallis test?
a. each sample has five or more values
b. the population is not normally distributed
c. when the variances are not equal
d. all of the above are assumptions of the Kruskal-Wallis test

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The expert examines Kruskal-Wallis test assumptions. The solution answers the question(s) below.