Question

8.62 Meta-analysis, mental health treatments, and cultural contexts (continued): The research paper on culturally targeted therapy described in the previous exercise reported the following:

Across all 76 studies, the random effects weighted average effect size was

d = .45 ( S E = .04 % p < .0001 ) , with a 95% confidence interval of d = .36 to d = .53.

The data consisted of 72 nonzero effect sizes, of which 68 (94%) were positive and 4 (6%) were negative. Effect sizes ranged from d = − 48 to d = 2.7. (Griner & Smith, 2006, p. 535)

1. What is the confidence interval for the effect size?

Answer 1

a. The 95% confidence interval for the effect size across all 76 studies is (0.36,0.53)