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1. A study by ]ylha and Isometsa [2006) found that the correlation between extraversion and depression was r = -.47 in a random sample from
1. A study by ]ylha and Isometsa [2006) found that the correlation between extraversion and depression was r = -.47 in a random sample from Finland. What can we conclude from this nding? a. Extraversion causes lower depression. b. People who score high on extraversion tend to score low on depression. c. There is no relationship between extraversion and depression. d. People who score high on extraversion tend to score high on depression. 2. In Question #1 above, what proportion of the variability in depression can be explained by its relationship with extraversion? Is it a small, medium, or large effect? (Hint: Think about what you are being asked to compute. What is the "proportion of variability explained\" the denition of?) 3. In each of the following pairs of correlations, identify the one that indicates a stronger relationship. a r=.56 r =.18 b r= -.25 r = -.60 C. 4. The age and reading ability (on a scale of 1-10) of five children are listed in the table below. Calculate the correlation coefficient, coefficient of determination, and interpret the latter value in terms of proportion of variability explained and effect size. Name Age Reading Score Addy 7 Carson 6 Peyton 10 Colty Leah5. A professor noted the number of absences and the final percentage grade for four students. Calculate the correlation coefficient, coefficient of determination, and interpret the latter value in terms of proportion of variability explained and effect size. Number of absences Final percentage grade 75 W O 90 10 55 5 80
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