Psychology 490
Spring 2015
Extra or Replacement Credit
Name: __________________
Date: ___________________
1. Five college students were asked about how important a goal it is to them to have a
family and about how important a goal it is for them to be highly successful in their
work. Each variable was measured on a scale from 0 “not at all important as a goal”
to 10 “very important goal”. Using the data below, make a scatter diagram of the
scores, describe in words the correlation, figure the correlation co-efficient (using
either alternative).
Student
A
B
C
D
E
Family Goal
7
6
8
3
4
Work Goal
5
4
2
9
1
2. The table below shows the amount of violent television young children watched and
the amount of violent behavior toward their playmates. The correlation is .92.
a. Determine raw score prediction formula for predicting number of aggressive
acts from hours of violent TV watched.
b. Use this formula to find the predicted test grades for each of the students.
c. Draw scattergram.
d. Figure error and squared error for each of the five predictions.
e. Find the proportionate reduce in error.
f. Take the square root of the proportionate reduction in error you figured to see
if it matches the correlation coefficient.
Participant
A
B
C
D
M
SD
No. Hrs. Violent TV Watched
Violent Tv
14
8
6
12
10
3.65
No. Aggressive Acts
9
6
1
8
6
1.56