SPPSS

PSYC 515

Homework: ANOVA SPSS Assignment

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Instructions

Overview

This worksheet is designed to assess your ability to perform, interpret, report, and graphically present randomized and repeated measures ANOVAs. These are standard tests in our field and are foundational to the more sophisticated research designs. Knowledge of these tests provide fundamental skills to critically evaluating and producing research in one’s field.

Instructions

Be sure you have reviewed this module’s assigned readings and presentations before completing this assignment. This assignment is worth 50 points. Each question is worth 3 content points except where otherwise indicated (results write-ups are 5 pts each- 45 content points total). Five (5) points are assigned to general formatting. This includes using ensuring the homework is completed and submitted according to the instructions, SPSS output and images are legible and relevant, and that basic college level writing skills (e.g., grammar) are used in the write-ups. Answers should be placed where indicated (e.g., “ANSWER”). Note: all questions must be attempted to be eligible for full credit of “format” points.

· Please note that for all problems in this course, the standard cut-off (alpha) for a test of significance will be .05, and you always report the exact power unless SPSS output states p=.000 (you’d report p<.001). Also, remember that we divide the p-value in half when reporting one-tailed tests with 1 – 2 groups. Also – remember to check your graphs! You often have to ADD the y – axis title.

· Sample sizes may be smaller than acceptable for publication purposes – this is to ease the burden on you for data entry, as the goal is to assess your ability to compute and interpret various statistical tests.

· Submit the file as a WORD document ( or x). Make sure the filename of your submission includes your full name, course and section.

· Example: SPSS2_JohnDoe_515B01

Scenario 1

A psychologist at a private mental health facility was asked to determine whether there was a clear difference in the length of stay for patients with different categories of diagnosis. Looking at the last seven patients in each of the three major categories, the results (in terms of weeks of stay) were as follows. Using the data below, test whether the length of stay for patients vary based on category of diagnosis.

 Diagnosis Category 

Affective Disorders 

Cognitive Disorders 

Drug-related Conditions 

7

12

8

6

8

10

5

9

12

6

11

10

9

11

9

5

10

11

6

9

12

1. In this specific scenario, what is the independent variable? Is it between or within subjects? How many levels does it have, and what are they?

ANSWER

2. Paste all relevant statistical output in the space provided below:

ANSWER

3. Create an appropriate graph in SPSS and paste it in the space provided below:

ANSWER

4. Present the results using APA format. This includes a full write-up to include a complete statistical notation as shown in the weekly presentations. The write-up also needs interpretation. If significant, state how. If it is not significant, what does that mean in layman’s terms? Additional examples of APA results sections are also available in the “Helpful Hints” document. (5 pts)

ANSWER

5. What is a potential confounding variable in this scenario? Explain your rationale.

ANSWER

Scenario 2

The following data were obtained from a research study examining the effect of sleep deprivation on motor skills performance. A sample of five participants was tested on a motor-skills task after 24 hours of sleep deprivation, tested again after 36 hours, and tested once more after 48 hours. The dependent variable is the number of errors made on the motor-skills task, shown below. Use the data to test whether or not the number of hours of sleep deprivation has a significant effect on motor skills performance.

 Participant 

24 hours 

36 hours 

48 hours 

6. In this specific scenario, what is the independent variable? Is it between or within subjects? How many levels does it have, and what are they?

ANSWER

7. Paste all relevant statistical output in the space provided below:

ANSWER

8. Create an appropriate graph in SPSS and paste it in the space provided below:

ANSWER

9. Present the results using APA format. This includes a full write-up to include a complete statistical notation as shown in the weekly presentations. The write-up also needs interpretation. If significant, state how. If it is not significant, what does that mean in layman’s terms? Additional examples of APA results sections are also available in the “Helpful Hints” document. (5 pts)

ANSWER

Scenario 3

It has been suggested that pupil size increases during emotional arousal. A researcher would, therefore, like to see whether the increase in pupil size is a function of the type of arousal (pleasant versus aversive). A random sample of five participants is selected for the study. Each participant views all three stimuli: neutral, pleasant, and aversive photographs. The neutral photograph portrays a plain brick building. The pleasant photograph consists of a young man and woman sharing a large ice cream cone. Finally, the aversive stimulus is a graphic photograph of an automobile accident. Upon viewing each stimulus, the pupil size is measured (in millimeters) with sophisticated equipment. The data are as follows. Use it to test whether pupil size varies based on type of arousal.

 

Stimulus 

Participant 

Neutral 

Pleasant 

Aversive 

4

10. In this specific scenario, what is the independent variable? Is it between or within subjects? How many levels does it have, and what are they?

ANSWER

11. Paste all relevant statistical output in the space provided below:

ANSWER

12. Create an appropriate graph in SPSS and paste it in the space provided below:

ANSWER

13. Present the results using APA format. This includes a full write-up to include a complete statistical notation as shown in the weekly presentations. The write-up also needs interpretation. If significant, state how. If it is not significant, what does that mean in layman’s terms? Additional examples of APA results sections are also available in the “Helpful Hints” document. (5 pts)

ANSWER

Note: Your assignment will be checked for originality via the Turnitin plagiarism tool.

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