To conduct the Kruskal-Wallis test for comparing three different methods of treatment, one needs to state the null hypothesis as H₀: μ₁ = μ₂ = μ₃ and alternative hypothesis as Ha: μ₁ ≠ μ₂ ≠ μ₃.

Question

Quizplus · Accepted Answer

The correct null hypothesis for the Kruskal-Wallis test is that the median (or mean rank) of all groups are equal, not specifically about the means (μ) being equal. The alternative hypothesis should suggest that at least one group's median (or mean rank) differs from the others, not necessarily that all group medians are different from each other.

To Conduct the Kruskal-Wallis Test for Comparing Three Different Methods