Nurcombe and Fitzhenry-Coor (1979) have argued that training in diagnostic techniques should lead a clinician to generate and test more hypotheses in coming to a decision about a case. Suppose we take 10 psychiatric residents who are just beginning their residency and use them as participants. We ask them to watch a videotape of an inter- view and to record their thoughts on the case every few minutes. We then count the number of hypotheses each resident includes in his or her written remarks. The experi- ment is repeated with the same residents at the end of the residency with a comparable videotape. The data are given.
Participant
|
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
|
Before
|
8
|
4
|
2
|
2
|
4
|
8
|
3
|
1
|
3
|
9
|
|
After
|
7
|
9
|
3
|
6
|
3
|
10
|
6
|
7
|
8
|
7
|
(a) Analyze the data using Wilcoxon's matched-pairs signed-ranks test.
(b) What would you conclude?