PSY 205: Research Methods I
Module 7: Assignment
1.
A
researcher is interested in the relationship between fathers’
performance in
high school and their children’s social skills.
She obtains the high school transcripts of fathers and
records their
ending GPA. She then measures the social skills of their
oldest child.
Use the data shown below to:
A. Calculate
the Pearson r correlation
coefficient.
B. Test
for the significance of the correlation using a two-tailed
test at the .05
level.
C. Show
the scatterplot for the data.
D. Determine
the coefficient of determination and explain what this means.
E. Determine
the coefficient of alienation (nondetermination) and explain
what this means.
F. Explain
to a friend what this correlation coefficient tells you about
the relationship
between fathers’ high school GPA and children’s social
skills.
G. Explain
to your friend what this correlation does not tell you about
the relationship
between these two variables. Suggest a
third variable that may be a work here.
H. Determine
the regression equation.
I. Predict
the social skills level of a child whose father had a high
school GPA of 2.10.
J. Predict
the social skills level of a child whose father had a high
school GPA of 3.40.
Participant
Father’s GPA
Child’s Social Skills
1
3.24
65
2
2.68
63
3
2.1
61
4
3.8
67
5
3.26
67
6
3.21
61
7
3.8
70
8
2.5
54
9
2.64
54
10
3.12
58
11
3.08
57
12
3.28
62
13
2.45
59
14
2.83
61
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