In a study of personality and depression, Dr. Marek finds a correlation of -0.90 between optimism and depression, and a correlation of +0.50 between introversion and depression. Assuming both correlations are significant, which of the following conclusions can Dr. Marek safely draw from this research? I. Optimism is negatively related to depression. II. Depression is more strongly related to optimism than to introversion. III. High optimism scores tend to be associated with low depression scores. IV. Low introversion scores tend to be associated with high depression scores.
a. I and IV
b. I and II
c. II and III
d. I, II, and II
Ans: D
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