Question: Students were asked to rate a teacher on a scale of 1 to 20. The students were grouped by the grade they made in the class. Is there a difference in the ranks given by students with different grades? Test at the .01 level. Assume that the population is not normally distributed, so use the Kruskal-Wallis test. State the hypotheses and identify the claim, find the critical value(s), compute the test value, make the decision, summarize the results.

A or B C D or F

16 19 12

17 18 14

18 16 15

15 14 10

16 19 12

17