A professor computes the mean difference in exam scores before and after a lecture as 9.0 ± 14.5 (MD ± SD), and this difference was significant. What is the effect size for this result using estimated Cohen's d?
A. d = 0.62 (medium effect)
B. d = 1.61 (medium effect)
C. d = 0.62 (large effect)
D. d = 1.61 (large effect)
Ans: A
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