Question: 6. Consider the data in Exercise 5. (a) Conduct the Kruskal-Wallis test at level = 0.05 and state what assumptions, if any, are needed

6. Consider the data in Exercise 5.

(a) Conduct the Kruskal-Wallis test at level α = 0.05 and state what assumptions, if any, are needed for its validity.

(b) Use the Bonferroni multiple comparisons method with the rank-sum test to identify the groups whose population means differ significantly at experimentwise level of α = 0.05.

(c) Repeat part

(b) using Tukey’s multiple comparisons procedure on the ranks.

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