Childhood participation in sports, cultural groups, and youth groups appears to be related to improved self­esteem for adolescents (McGee, Williams, Howden-Chapman, Martin, &amp; Karachi, 2006). In a representa­tive study, a sample of n – 100 adolescents 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 of μ – 50 and a standard deviation of σ = 15 The sample of group participation adolescents had an average of M = 53.8. a. Does this sample provide enough evidence to conclude that self-eastern scores for these adolescents are significantly different from those of the general population? Use a two-tailed test with α – .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 appear in a research report.

Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
Publisher: Cengage Learning
ISBN: 9781133956570

Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
Publisher: Cengage Learning
ISBN: 9781133956570

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