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Wilcoxson rank sum test

Please help with a wilcoxon some help in the following.

The group is for 65 teachers doing a pretest post and at 12 months knowledge quiz on diversity in the class room...I need the following test
(wilcoxon with p value set at 0.05 and any explanation you can offer on any significant findings. I know there are differences and they are already significant..I need a chart to include in my analysis so it looks polished. The quiz is an 20 item quiz. Here are the results:

Before

Line Scores
1 14
2 10
3 10
1 13
2 11
3 16
4 14
5 11
6 11
7 9
8 17
9 16
10 14
11 14
12 13
13 17
14 9
15 15
16 18
17 13
18 9
19 13
20 11
21 10
22 17
23 16
24 19
25 17
26 14
27 15
28 10
29 12
30 16
31 16
32 13
33 18
34 11
35 9
36 17
37 18
38 16
39 11
40 16
41 15
42 14
43 10
44 12
45 11
46 16
47 18
48 18
49 18
50 11
51 9
52 15
53 13
54 10
55 9
56 9
57 12
58 16
59 18
60 9
61 17
62 12
63 14
64 13
65 9

After

Line Scores
1 17
2 16
3 18
4 15
5 20
6 17
7 19
8 15
9 19
10 17
11 17
12 19
13 17
14 20
15 18
16 20
17 18
18 20
19 20
20 20
21 20
22 17
23 18
24 16
25 20
26 20
27 19
28 20
29 15
30 20
31 17
32 19
33 19
34 19
35 15
36 19
37 19
38 19
39 19
40 18
41 16
42 19
43 16
44 20
45 19
46 19
47 16
48 19
49 17
50 19
51 20
52 18
53 18
54 19
55 19
56 17
57 1 9
58 19
59 14
60 19
61 18
62 19
63 19
64 17
65 18.

Solution Preview

Please see full answers in the attached files.

Wilcoxon Rank sum test
The group is for 65 teachers doing a pretest post and at 12 months knowledge quiz on diversity in the class room...I need the following test (wilcoxon with p value set at 0.05 and any explanation you can offer on any significant findings. I know there are differences and they are ...

Solution Summary

Step-by-step method for computing test statistic for Wilcoxson rank sum test is given in the answer.

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