Problem Set 1: The One-way ANOVA
Research Scenario: Depressed patients are randomly assigned to 1 of 3 therapists. At the end of 3 months, each patient completes a standardized test of depression (higher scores indicate higher level of depression). The patients’ scores are shown below. Analyze the data to determine how effective these 3 therapists are at treating depression (assume that before the treatment, all 3 groups of patients had the same average depression score).
Using this table, enter the data into a new SPSS data file and run a one-way ANOVA to test whether there is a difference in patients’ depression scores among the three therapists. Create a boxplot to show the difference among these scores.
Therapist 1
35
37
35
37
36
33
39
Therapist 2
36
37
37
31
39
35
32
Therapist 3
29
32
25
28
33
30
32
1. Paste SPSS output. (7 pts)
2. Write an APA-style Results section based on your analysis. Include your boxplot as an APA-style figure as demonstrated in the APA writing presentation. (Results = 8 pts; Graph = 5 pts)
Problem Set 2: The One-way ANOVA
Research Scenario: As part of a new prevention program, a clinical psychologist wants to see whether feelings of alienation differ as a function of immigration status in a local high school. She divides volunteer students into three categories: first-generation immigrants, second-generation immigrants, and non-immigrants. She then administers an instrument assessing feelings of alienation, where higher scores indicate stronger feelings of alienation from peers, adults, and society in general. Is there a difference in alienation scores among these three groups?
Using this table, enter the data into a new SPSS data file and run a one-way ANOVA to test whether there is a difference in feelings of alienation among the three groups. Create a boxplot to show the difference in alienation scores among the three groups.
First-generation
immigrants
35
39
34
37
36
23
39
Second-generation
immigrants
26
37
28
29
36
25
18
Non-immigrants
29
22
17
25
19
30
16
1. Paste SPSS output. (7 pts)
2. Write an APA-style Results section based on your analysis. Include your boxplot as an APA-style figure as demonstrated in the APA writing presentation. (Results = 8 pts; Graph = 5 pts)
