PSC 103B Statistical Analysis of Psychological Data
Homework #4
Due: 2/14/2008
1.
A research lab recorded the speed with which subjects summoned help for a person in
trouble.
The subjects were randomly assigned to 3 groups.
Group 1 thought that they
were the only one listening to the person in trouble (n
1
= 13).
Group 2 thought that one
other person was also listening (n
2
= 26).
Group 3 thought that 4 other people were also
listening (n
2
= 13).
The dependent variable was the speed with which the subject called
for help ( = 1/time x 100).
The mean speed scores for the 3 groups were group
1
= .87,
group
2
= .72, group
3
= .51.
The MS
within
=.053.
(Total: 3 points)
a.
Reconstruct the analysis of variance summary table; the red squares will remain
empty. (1.5 points)
b.
What is the critical value of the Fstatistic at alpha = .05? (0.5 points)
c.
What conclusions can you make based on this table about how long it takes for
someone to call for help when witnessing a person in trouble? (1 point)
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 Winter '08
 FerrerCaja
 Psychology, Statistics, SS df MS, PSC 103B Statistical, Psychological Data Homework, mean speed scores

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