A social psychologist wants to know how long people will wait before responding to cries for help from an unknown person and whether the gender or age of the person in need of help makes any difference. One at a time, subjects sit in a room waiting to be called for an experiment. After a few minutes they hear cries for help from the next room, which are actually on a tape recording. The cries are in either an adult male's, an adult female's, or a child's voice; seven subjects are randomly assigned to each condition. The dependent variable is the number of seconds from the time the cries begin until the subject gets up to investigate or help.
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Child's Voice
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Adult Female Voice
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Adult Male Voice
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|
10
|
17
|
20
|
|
12
|
13
|
25
|
|
15
|
16
|
14
|
|
11
|
12
|
17
|
|
5
|
7
|
12
|
|
7
|
8
|
18
|
|
2
|
3
|
7
|
a. Do these data indicate any significant differences among the three groups? Test with a = .05. Show all 4 steps.
b. Present the results of the ANOVA in a summary table.
c. Compute h2 , the percentage of variance accounted for by the treatment.
d. Compute Tukey's HSD to determine where the significant difference is. (You will also need to know Scheffe, so I would practice it too but it's not required for homework).
e. Write a sentence demonstrating how a research report would present the results of the hypothesis test and the measure of effect size