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Kruskal-Wallis test assumptions

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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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Please help with the following problem.

A researcher wants to know if there is a relationship between a person's highest level of education (IV) and differences in life satisfaction (DV). She places her subjects into three samples (less than a high school degree, high school graduate, some college or college degree). She creates a life satisfaction survey using a 4-point ordinal scale.

Would the Kruskal-Wallis be an appropriate statistical procedure to test this RQ? Please explain your answer.

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