Statistics: Testing Hypothesis with the Z-statistic – #140


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.

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