A researcher randomly assigns 33 subjects to one of three groups. Group 1 receiv
ID: 3357109 • Letter: A
Question
A researcher randomly assigns 33 subjects to one of three groups. Group 1 receives technical dietary information interactively from an on-line website. Group 2 receives the same information from a nurse practitioner, while Group 3 receives the information from a video tape made by the same nurse practitioner.
The researcher looked at three different ratings of the presentation; difficulty, usefulness, and importance to determine if there is a difference in the modes of presentation. In particular, the researcher is interested in whether the interactive website is superior because that is the most cost-effective way of delivering the information.
Group
Usefulness
Difficulty
Importance
1
20
5
18
1
25
9
8
1
23
15
20
1
16
9
22
1
20
6
22
1
28
14
8
1
20
6
13
1
25
8
13
1
24
10
24
1
18
10
20
1
17
9
4
2
28
7
14
2
25
14
5
2
26
9
20
2
19
15
22
2
29
14
12
2
15
6
2
2
29
10
5
2
26
11
1
2
22
5
2
2
15
15
14
2
29
6
4
2
15
6
3
3
22
8
12
3
27
9
14
3
21
10
7
3
17
9
1
3
16
7
12
3
19
9
7
3
23
10
1
3
27
9
5
3
23
9
6
3
16
14
22
Run a MANOVA analysis of the data and interpret the results.
How could this study have been done differently? Why or why not would this approach be better?
Group
Usefulness
Difficulty
Importance
1
20
5
18
1
25
9
8
1
23
15
20
1
16
9
22
1
20
6
22
1
28
14
8
1
20
6
13
1
25
8
13
1
24
10
24
1
18
10
20
1
17
9
4
2
28
7
14
2
25
14
5
2
26
9
20
2
19
15
22
2
29
14
12
2
15
6
2
2
29
10
5
2
26
11
1
2
22
5
2
2
15
15
14
2
29
6
4
2
15
6
3
3
22
8
12
3
27
9
14
3
21
10
7
3
17
9
1
3
16
7
12
3
19
9
7
3
23
10
1
3
27
9
5
3
23
9
6
3
16
14
22
Explanation / Answer
General Linear Model: usefulness, difficulty, importance versus group
MANOVA for group
s = 2 m = 0.0 n = 13.0
DF
Criterion Test Statistic F Num Denom P
Wilks’ 0.74289 1.495 6 56 0.197
Lawley-Hotelling 0.33522 1.509 6 54 0.193
Pillai’s 0.26520 1.478 6 58 0.202
Roy’s 0.29882
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