In another comparison of study guides A and B, the following scores were obtaine
ID: 3275684 • Letter: I
Question
In another comparison of study guides A and B, the following scores were obtained (out of 100): Study Guide A: 82 92 84 77 90 85 Study Guide B: 68 77 70 63 77 71 65 Use the Wilcoxon test to test the null hypothesis that the distributions of scores are the same for each study guide, against the two-sided alternative that the distributions are different Calculate W, the observed sum of ranks of the study guide A scores. 491 3 pts)] Submit Answer Incorrect. Tries 2/3 Previous Tries 2 pt(s)] What is the mean of W, under the null hypothesis? Submit Answer Tries 0/3 What is the variance of W, under the null hypothesis? 12 pt(s)l Submit Answer Tries o/3 Calculate the standardized test statistic. 3 pt(s)) Submit Answer Tries o/3 Which of the statistical tables should you use? O t-distribution z-distribution X"-distribution [1 pt(s)] Submit Answer Tries of1 Calculate the p-value for the test 13 pt(s)] Submit Answer Tries o/Explanation / Answer
Answer:
a). Observed sum of ranks of study guide A = 62
b). Mean of W= 42
c). Variance of W = 49
d). standard test statistic =2.857
e). z distribution
f). P=0.0043
Wilcoxon - Mann/Whitney Test
n
sum of ranks
6
62
A
7
29
B
13
91
total
42.000
expected value
7.000
standard deviation
2.857
z
.0043
p-value (two-tailed)
No.
Label
Data
Rank
1
A
82
9
2
A
92
13
3
A
84
10
4
A
77
7
5
A
90
12
6
A
85
11
7
B
68
3
8
B
77
7
9
B
70
4
10
B
63
1
11
B
77
7
12
B
71
5
13
B
65
2
Wilcoxon - Mann/Whitney Test
n
sum of ranks
6
62
A
7
29
B
13
91
total
42.000
expected value
7.000
standard deviation
2.857
z
.0043
p-value (two-tailed)
No.
Label
Data
Rank
1
A
82
9
2
A
92
13
3
A
84
10
4
A
77
7
5
A
90
12
6
A
85
11
7
B
68
3
8
B
77
7
9
B
70
4
10
B
63
1
11
B
77
7
12
B
71
5
13
B
65
2
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