A professor has a teaching assistant record the amount of time (in minutes) that
ID: 2947420 • Letter: A
Question
A professor has a teaching assistant record the amount of time (in minutes) that a sample of 16 students engaged in an active discussion. The assistant observed 8 students in a class who used a slide show presentation and 8 students in a class who did not use a slide show presentation Without Microsoft With Microsoft M 12 18 13 19 15 21 10 23 14 Use the normal approximation for the Mann-Whitney U test to analyze the data above. (Round your answer to two decimal places.) State whether to retain or reject the null hypothesis. (ASSume alpha equal to 0.05.) Retain the null hypothesis. O Reject the null hypothesis.Explanation / Answer
Result:
a).
z =1.16
retain the null hypothesis.
Wilcoxon - Mann/Whitney Test
n
sum of ranks
8
79
With
8
57
without
16
136
total
68.000
expected value
9.522
standard deviation
1.155
z
.2480
p-value (two-tailed)
No.
Label
Data
Rank
1
With
12
9
2
With
18
13
3
With
13
10
4
With
19
14
5
With
7
4
6
With
23
16
7
With
5
2
8
With
14
11
9
without
4
1
10
without
15
12
11
without
21
15
12
without
10
7
13
without
11
8
14
without
9
6
15
without
6
3
16
without
8
5
b).
chi square = 8.40
Reject the null hypothesis.
Friedman Test
Sum of Ranks
Avg. Rank
6.00
1.20
prior
9.00
1.80
At
15.00
3.00
After
30.00
2.00
Total
5
n
8.400
chi-square (corrected for ties)
2
d.f.
.0150
p-value
multiple comparison values for avg. ranks
1.51
(.05)
1.86
(.01)
prior
At
After
1
2
3
1
2
3
2
1
3
1
2
3
1
2
3
Wilcoxon - Mann/Whitney Test
n
sum of ranks
8
79
With
8
57
without
16
136
total
68.000
expected value
9.522
standard deviation
1.155
z
.2480
p-value (two-tailed)
No.
Label
Data
Rank
1
With
12
9
2
With
18
13
3
With
13
10
4
With
19
14
5
With
7
4
6
With
23
16
7
With
5
2
8
With
14
11
9
without
4
1
10
without
15
12
11
without
21
15
12
without
10
7
13
without
11
8
14
without
9
6
15
without
6
3
16
without
8
5
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