1. A researcher is interested in comparing the effectiveness of three different kinds of therapy for anger problems. Eight participants are randomly assigned to three treatment conditions: Cognitive Therapy (CT), Cognitive-Behavioral Therapy (CBT), and Interpersonal Therapy (IT). All participants complete the weekly treatment for 8 weeks. Participants take an anger test before and after the 8-week treatments. Each participant’s difference score (= anger score after the treatment minus (–) anger score before the treatment) is shown in the following table. The three therapists in this experiment have equal educational levels and clinical experiences.
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To compare the effectiveness of the three different kinds of therapy for anger problems, the researcher randomly assigned eight participants to three treatment conditions: Cognitive Therapy (CT), Cognitive-Behavioral Therapy (CBT), and Interpersonal Therapy (IT). All participants completed the weekly treatment for 8 weeks.
To determine the effectiveness of the therapy, all participants took an anger test before and after the 8-week treatments. The difference score for each participant was calculated by subtracting their anger score after the treatment from their anger score before the treatment.
The difference scores for each participant are displayed in the following table.
Participant Treatment Difference Score
1 CT 10
2 CT 5
3 CBT 8
4 CBT 12
5 IT 2
6 IT 4
7 IT 6
8 IT 9
It's important to note that the therapists in this experiment have equal educational levels and clinical experiences, ensuring that the differences in therapy effectiveness are not influenced by therapist factors.
This design allows for a comparison of the effectiveness of the three therapy types for anger problems by analyzing the difference scores across the treatment conditions.