Which test more powerful, sign or wilcoxon signed-rank test

Reference no: EM13953033

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

Reference no: EM13953033

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