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A Professor Computes the Mean Difference in Exam Scores Before

Question 55

Multiple Choice

A professor computes the mean difference in exam scores before and after a lecture as 9.0±14.5 ( A professor computes the mean difference in exam scores before and after a lecture as 9.0±14.5 ( ) ,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) ) ,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)

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