Question: Refer to Exercise 9.30. a. Use a nonparametric procedure to compare the mean discoloration scores of groups II, III, and IV. Use an experimentwise error

Refer to Exercise 9.30.
a. Use a nonparametric procedure to compare the mean discoloration scores of groups II, III, and IV. Use an experimentwise error rate of .05.
b. Compare your results in part (a) to your conclusions from Exercise 9.30. Why is the Tukey’s W procedure more appropriate in this situation?

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