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

A or B C D or F

16 19 12

17 18 14

18 16 15

15 14 10

16 19 12

17