In the following study, participants were randomly assigned to receive humanistic therapy, psychodynamic therapy, or behavioral therapy for their depression. Six months after therapy ended, participants' levels of depression were rated on a Likert scale from 1 (not at all depressed) to 15 (extremely depressed).
GROUP N MEAN STD DEV STD ERROR
1 (Humanistic) 10 5.40 2.17 0.69
2 (Psychodynamic) 10 7.50 2.84 0.90
3 (Behavioral) 10 5.60 3.13 0.99
ONEWAY ANOVA: THERAPY by DEPRESSION
SUM OF MEAN
SOURCE SQUARES DF SQUARES F RATIO PROB.
BETWEEN GROUPS 26.87 2 13.73 1.78 .187
WITHIN GROUPS 203.30 27 7.53
TOTAL 230.17 29
POST HOC TEST: Tukey-HSD with significance level .05
* in a cell indicates significant differences shown for pairings
GROUPS 1 (5.40) 2 (7.50) 3 (5.60)
1 (5.40)
2 (7.50)
3 (5.60)
a. Describe the design of this study and explain how you know this.
b. Identify the independent and dependent variables, and name the scales of measurement for each.
c. What kind of inferential analysis was conducted?
d. Did the independent variable have a significant effect on the dependent variable? How do you know?
e. Write a complete APA-format conclusion for these results.