Participation in organized social activities (e.g., sports, clubs/groups) seems to improve self-esteem in adolescents. In one...
Participation in organized social activities (e.g., sports, clubs/groups) seems to improve self-esteem in adolescents. In one study, a sample of 100 adolescents with a history of group participation are given a self-esteem questionnaire. Researchers already know that the scores on this questionnaire are normally distributed and that the general population of adolescents have a mean score of µ = 50 and σ = 15. The sample (N = 100) produces a mean score of M = 53.8. Calculate Cohen’s d based on this information; show all of your calculations for full credit.
Homework Answers
Solution :
From given that ,
Cohen’s d = (
- 
) / 
= (53.8 - 50) / 15 = 0.2533
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Participation in organized social activities (e.g., sports,
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APA
style please
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Q1. Although there is a popular belief that herbal remedies such as Ginkgo biloba and Ginseng may improve learning and memory in healthy adults, these effects are usually not supported by well-controlled research. In a typical study, a researcher obtains a sample of n 36 participants and has each person take the herbal supplements every day for 90 days. At the end of the 90 days, each person takes a standardized memory test. This...
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