Question

what is the parametric equivalent test for the Wilcoxon signed-rank test? What is the difference between the Wilcoxon rank sum test and the Wilcoxon signed-rank test? For Exercises 3 and 4, find the sum of the signed ranks. Acsume that the samples are dependent. State which sum is used as the test value. 3. Pretest 106 85 117 163 154 106 152 Posttest 112 84 105 167 142 113 143 4. Pretest 25 38 62 49 63 29 74 82 Posttest | 29 45 51 45 71 32 74 87 For Exercises 5 through use Table K to determine

Please answer guestion 4. and how it is solved. Thank you.

Answer 1

We need to find the difference in the post-test and pre-test scores first (calculated in Column 3 in the table below). Then, we need to find the ranks of the absolute differences. After calculating the ranks, we separate them into positive and negative ranks on the basis of whether the difference was positive or negative. The following table shows the calculations:

Pretest	Posttest	Diff	Abs Diff	Rank of Abs Diff	Positive Ranks	Negative Ranks
25	29	4	4	2.5	2.5
38	45	7	7	5	5
62	51	-11	11	7		7
49	45	-4	4	2.5		2.5
63	71	8	8	6	6
29	32	3	3	1	1
74	74	0	0
82	87	5	5	4	4
					18.5	9.5

Sum of Positive ranks = 18.5

Sum of Negative ranks = 9.5