1 apply the sign test to the above example did the results, Ask an Expert

Statistics

1. Apply the sign test to the above example. Did the results change? Which test is more powerful, the sign test or the Wilcoxon signed-rank test? Why?

2. Suppose we compare four instructors for consistency of grading. Use the following table to apply the Kruskal-Wallis test to determine whether there is a difference among instructors.

Grade Counts for Students by Instructor

Instructor
Grade	1	2	3	4	Row Totals
A	4	10	6	20	40
B	14	6	7	10	37
C	17	9	8	5	39
D	6	7	6	5	24
F	2	6	1	10	19
Total # of students	43	38	28	50	159

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Statistics and Probability, Statistics

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