PSYC 355 SPSS HOMEWORK 6-A professor wants to determine the effect

PSYC 355 SPSS HOMEWORK 6 INSTRUCTIONS
PREDICTION: BIVARIATE LINEAR REGRESSION
Part One:
Problem 1: Linear regression
File: Open “Module 6 Exercise File 1” found in Blackboard
Course Content (Course Guides and Assignment Instructions
—Assignment Instructions—SPSS Homework—SPSS
Homework 6 Files).
Note: You will use raw data for all homework exercises
with no need to convert to z scores.
Research Scenario: A professor wants to determine the effect
of test-related anxiety on exam scores in her class. She
administers a measure on which higher scores indicate higher
levels of test-related anxiety. After the class takes the exam,
the professor records the grades (out of 90 points possible)
next to the anxiety scores. Conduct a linear regression to
determine whether test-related anxiety predicts exam
grades. Use raw scores, not z scores, in the regression
analysis. Again, there is no need to create z scores for this
problem.
1. Paste SPSS output. (3 pts)
2. Answer the following questions:
a. What is the value of the slope in your output? (3 pts)
b. What is the value of the additive constant? (3 pts)
c. What is the mean anxiety score? (3 pts)
d. What is the correlation between anxiety scores and exam scores, as given in the
output? (3 pts)
3. Create a scatterplot of the relationship between the two variables. Plot the regression line
on the graph. (3 pts)
4. Write a Results section based on your findings. All homework “Results sections” must
follow the example given in the SPSS tutorial presentations and the Course Content
document “Writing Results of Statistical Tests in Current APA Format.” Note: The
statistical statement for a bivariate linear regression must include at least the
equation of the line and the confidence interval for the slope (the second row under
Confidence Intervals in the output), as well as a decision about the null hypothesis.
(3 pts)
Page 1 of 5 PSYC 355 Page 2 of 5 PSYC 355 Part Two:
Problem Set 1: Linear Regression
Research Scenario: A social psychologist is studying the
effect of past cult membership on forming attachments in new
relationships. She recruits a sample of adult men and women
(age 18+) who were involved in a known cult but
subsequently left. She gathers data on the time (in months)
spent in the cult, and she also administers a questionnaire
designed to measure attachment-related issues. Higher scores
indicate more difficulty forming attachments. She compiles
the information in the table below. Conduct a bivariate
linear regression to analyze the research question.
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.
Months in Cult
13
6
9
10.5
29
23.5
6
3.5
30
36
48.5
22
19
7
9.5
11
11.5 Attachment
5
13
17
6
9
9
8
7
11
14
18
12
8
3
6
17
8 a) Paste SPSS output (3 pts)
b) Construct a scatterplot of the relationship between the 2 variables. Plot the regression line
on this graph. (3 pts) Page 3 of 5 PSYC 355 c) Are the number of months spent in a cult predictive of attachment problems in this
sample? Write a Results section in current APA style describing the outcome. All
homework “Results sections” must follow the example given in the SPSS tutorial
presentation and the Course Content document “Writing Results of Statistical Tests in
Current APA Format.” The statistical statement for a bivariate linear regression must
include at least the equation of the line and the confidence interval for the slope (the
second row under Confidence Intervals in the output), as well as a decision about the
null hypothesis. (3 pts)
Part Three: Cumulative Homework
Problem Set 1: Choose the correct method from tests
learned in previous modules.
Research Scenario: A counselor wants to study the
relationship between social isolation and attitudes towards
suicide. He collects scores from a sample of 13 patients on
two measures: one is a measure of social isolation on which
higher scores indicate higher isolation (possible range of
scores = 0- 20), and the other is the Suicide Risk Scale (SRS,
Plutchik et al., 1989), on which higher scores indicate a higher
risk of suicide (possible range of scores = 0-15). Is there a
significant relationship between these variables? Choose the
correct test to analyze this question, set up the SPSS file, and
run the analysis. Follow the directions under the table on the
following page.
Social Isolation
3
6
8
7
17
2
14
10
7
3
11
9
9 SRS
1
3
3
5
11
5
11
10
9
6
5
12
5 a. Paste appropriate SPSS output. (4 pts) Page 4 of 5 PSYC 355 b. Paste appropriate SPSS graph. (3 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.” (3 pts)
Submit this assignment by 11:59 p.m. (ET) on Monday of Module/Week 6. Page 5 of 5