4. Childhood participation in sports, cultural groups, and youth groups appears to be related to improved self-esteem for adolescents (McGee, Williams, Howden-Charman, Martin, & Kawachi, 2006). In a...

Extracted text: 4. Childhood participation in sports, cultural groups, and youth groups appears to be related to improved self-esteem for adolescents (McGee, Williams, Howden-Charman, Martin, & Kawachi, 2006). In a representative study, a sample of n = 100 adoles- cents with a history of group participation is given a standardized self-esteem questionnaire. For the general population of adolescents, scores on this questionnaire form a normal distribution with a mean %3D %3D of µ = 50 and a standard deviation of o = 15. The %3D


Extracted text: sample of group-participation adolescents had an average of M = 53.8. a. Does this sample provide enough evidence to con- clude that self-esteem scores for these adolescents are significantly different from those of the general population? Use a two-tailed test with a = .05. b. Compute Cohen's d to measure the size of the difference. c. Write a sentence describing the outcome of the hypothesis test and the measure of effect size as it would annear in a research report.