When submitting this file, be sure the filename includes your full name, course and section. Example: HW1_JohnDoe_355B03
When submitting this file, be sure the filename includes your full name, course and section. Example: HW1_JohnDoe_355B03
Please note that for all problems in this course, the standard cut-off (alpha) for a test of significance will be .05 unless otherwise noted in the problem. Also, remember that we divide the p value in half when reporting on one-tailed tests.
Part One:
Problem Set 1: The single-sample t test
File: Open “Module 1 Exercise File 1” found in Blackboard Course Content (Course Guides and Assignment Instructions—Assignment Instructions—SPSS Homework—SPSS Homework 1 Files).
Research Scenario: A clinical psychologist conducts group therapy with military veterans and wants to determine whether their scores on the Revised UCLA Loneliness Scale (R-UCLA-LS; Russell et al., 1980) are different from those in the general population. She administers the R-UCLA-LS to a group of 12 veterans and enters their scores into an SPSS data file (Exercise File 1). She knows that the population mean on the R-UCLA Loneliness Scale is 37, with higher scores indicating higher levels of loneliness. Conduct a single-sample t test to determine whether combat veterans score differently than the general population on the R-UCLA-LS.
Respond to the following items:
1. Paste SPSS output (2 pts). Beneath the output, type the answers to the following questions:
a. Mean R-UCLA-LS score for the sample of veterans (2 pts)
b. Standard deviation of the scores for the sample of veterans (2 pts)
c. p value (significance) of the test (2 pts)
2. Create a histogram that demonstrates the distribution of scores. Be sure to correctly label the X and Y axes and give your graph a title. (2 pts)
3. Write an APA-style Results section based on your analysis. All homework Results sections should follow the example given in the SPSS tutorials. Remember to include a decision about the null hypothesis. (3 pts)
Problem Set 2: The paired-samples t test
File: Open “Module 1 Exercise File 2” found in Blackboard Course Content (Course Guides and Assignment Instructions—Assignment Instructions—SPSS Homework—SPSS Homework 1 Files).
Research Scenario: A researcher is interested in whether pairs of identical twins have different SAT scores in late high school. She collects scores from a sample of 10 pairs of twins and enters them into an SPSS data file, labeling the groups as “Twin 1” and “Twin 2” (Exercise File 2). Conduct a paired-samples t test to determine whether there is a difference in SAT scores between twins.
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