Question

How effective are different psychotherapies? A large-scale study compared the

effectiveness of four major forms of therapy in the treatment of anxiety with a fifth control
condition: psychodynamic; humanistic; cognitive; behavior; no treatment (control condition).
Volunteer patients were assigned by the investigator to one of the five conditions. The
anxiety level of each patient after 6 months was measured, using an evaluation scale that
measures anxiety level on a 100-point scale. What statistical analysis would you use?
O Correlation
O t-test
Regression
ANOVA

Answer 1

ANOVA (Analysis of Variance) is the correct statistical analysis to compare the effectiveness of multiple psychotherapy treatments for anxiety against a control group.

Step-by-step explanation:

To assess the effectiveness of different psychotherapies in the treatment of anxiety and compare them to a control condition, the most appropriate statistical analysis to use would be ANOVA (Analysis of Variance). This test allows comparison of more than two groups to determine if there's a statistically significant difference in the mean anxiety levels after 6 months of therapy. Since there are four types of psychotherapy treatments plus a no treatment control, ANOVA is suitable for analyzing the differences across these multiple groups.