CORRELATION
Part 1:
Green & Salkind: Lesson 31, Exercises 14
The following helpful tips are numbered to correspond with the exercise number to which they
refer (a dash indicates that no tips are needed):
1. ———- (2 pts for output and 2 pts each for ac)
2. Answer this question in sentence form. Include the correlation (r) and degrees of
freedom, the p value, and whether these values indicate a significant correlation between
the variables or not. (2 pts)
3. All homework Results sections must follow the example given in the Course Content
document Writing Results of Statistical Tests in Current APA Format (Note: you do not
have to refer to a figure). (2 pts)
4. ———- (2 pts)
Part 2:
1. A clinical psychologist would like to determine whether there is a relationship between
observer ratings of childrens anxious behaviors and scores on an established diagnostic
interview assessing anxiety disorders. He administers the diagnostic interview to 28 children
and records these scores. He then trains an observer to independently rate anxiety-specific
behaviors for each of the 28 children. These ratings are totaled for an overall anxious
behavior score. On both the interview and the behavioral ratings, a higher score indicates
higher levels of anxiety. These scores are listed in the table on the following page. Conduct a
Pearson correlation coefficient analysis to determine whether there is a relationship
between the interview scores and the behavioral ratings for this group of children.
The steps will be the same as the ones you have been practicing in Part 1 of the assignment
the only difference is that you are now responsible for creating the data file as well.
Remember to name and define your variables under the Variable View, then return to the
Data View to enter the data. (3 pts)

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PSYC 355

Interview
(Range 09)
3
2
4
9
7
7
4
8
3
3
2
1
6
8
8
7
1
2
3
3
5
8
7
4
6
6
5
2

Anxious
Behavior Rating
(Range 025)
7
6
6
21
20
18
10
9
5
7
5
3
17
19
23
22
4
7
7
3
13
20
16
12
13
18
15
9

2. Create a simple scatterplot of the relationship between these variables (define interview scores
as the x-axis and behavioral ratings as the y-axis). (3 pts)
3. Write an APA-style Results section describing the outcome. All homework Results sections
must follow the example given in the Course Content document Writing Results of Statistical
Tests in Current APA Format (Note: you do not have to refer to a figure). Be sure to include
the direction of the relationship between the variables (positive? negative? none?) in your
section. (3 pts)

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PSYC 355

4. A neuropsychologist is assessing the relationship between brain function and performance on
a visuo-spatial task. He administers a test to 14 patients on which scores can range from 120:
a high score indicates normal brain function, and a low score indicates some levels of brain
dysfunction. He then asks each patient to complete a maze and records the number of
mistakes the patient makes from start to finish. The scores are listed in the table below.
Conduct a Pearson correlation coefficient analysis to determine what the relationship is,
if any, between brain function and performance on the maze task.
The steps will be the same as the ones you have been practicing in Part 1 of the assignment
the only difference is that you are now responsible for creating the data file as well.
Remember to name and define your variables under the Variable View, then return to the
Data View to enter the data. (3 pts)
Dysfunction Score
3
8
9
4
15
6
18
17
19
6
5
20
17
5

Number of
Mistakes on Maze
Task
25
18
18
26
6
19
3
4
6
16
14
2
5
23

5. Create a simple scatterplot of the relationship between these variables. (3 pts)
6. Write an APA-style Results section describing the outcome. All homework Results sections
must follow the example given in the Course Content document Writing Results of Statistical
Tests in Current APA Format (Note: you do not have to refer to a figure). (3 pts)
7. The null hypothesis for this scenario can be written as follows: There is no relationship
between level of brain function and the number of mistakes made on a maze task. Based on
your results, should this hypothesis be rejected or retained, and why? Write your answer in
sentence form. (2 pts)

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PSYC 355

Part 3: Cumulative Homework
1. A developmental psychologist is studying whether students in a certain preschool program
perform better than preschoolers in the state in general on a measure of math readiness. The
mean score for preschoolers in the state on the measure is 87. The psychologist tests the
preschoolers in the program and records the scores in the table below. Choose the correct test
to analyze this question, set up the SPSS file, and run the analysis. Follow the directions under
the table below.
Math Readiness
Scores
90
89
86
91
78
92
88
73
79
89
88
91
93
89
92
a) Paste appropriate SPSS output. (2 pts)
b) Paste appropriate SPSS graph. (2 pts)
c) Write a Results section in current APA style describing the
outcome. All homework Results sections must follow the
example given in the Course Content document Writing Results
of Statistical Tests in Current APA Format (Note: you do not have
to refer to a figure). (2 pts)