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For which of the following pearson correlations would

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19. For which of the following Pearson correlations would the data points be clustered most closely around a straight line? a. r = –0.10 b. r = +0.40 c. r = –0.70 d. There is no relationship between the correlation and how close the points are to a straight line. 20. A recent study looked at the performance of 10 baseball players before and after they appeared on the cover of Sports Illustrated. They found that before appearing on the cover these players had an average batting average of 0.337 and after appearing on the cover they had an average batting average of 0.303. The most likely explanation for this drop in performance is 21. A meta-analysis is a method researchers use to

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RESEARCH STUDY 8.1 Dr. Oswald conducts a study examining the relationship between the number of friends one has and the experience of daily stress and life satisfaction. She randomly samples 1,500 elderly men and women in the Memphis, Tennessee, area in the southern United States. Below are her findings. Life satisfaction and experience of daily stress: r = 0.57 (p = .01) Number of friends one has and experience of daily stress: r = 0.09, not sig. Number of friends one has and life satisfaction: r = .36 (p = .04) Refer to Research Study 8.1 to answer the following five questions. 22. In evaluating Dr. Oswald’s study, you question the construct validity of the study. Which of the following questions would you be asking? a. How did Dr. Oswald recruit her participants? b. Which statistic did Dr. Oswald compute? c. How reliable is the measure of daily stress? d. Does the number of friends cause people to experience less stress? 23. Comparing all three correlations, Dr. Oswald will be most able to accurately predict life satisfaction from the experience of daily stress because: 24. The “not sig.” in Dr. Oswald’s findings indicates all of the following EXCEPT: a. It is possible that the association between number of friends one has and experience of daily stress is from a population with zero association. b. Effect size could not be calculated. c. There is not a statistically significant association between the two variables. d. She cannot reliably predict a study participant’s experience of daily stress from the participant’s number of friends.
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• Spring '12
• StephanieMilan
• Dr. Lopez, Dr. Oswald

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