The difference between experimental group mean and control group mean divided by the standard deviation of the control group is called the
A) coefficient of determination.
B) mean adjusted difference.
C) z-score
D) effect size.
E) deviation score

Question

Quizplus · Accepted Answer

The formula described in the question is known as Cohen's d, which is a measure of effect size. Therefore, the correct answer is D. A is incorrect because the coefficient of determination is a measure used in regression analysis to determine how well the model fits the data. B and E are both incorrect because they are not actual measures used in statistics. C is incorrect because a z-score would involve subtracting the mean of the control group from an individual's score and dividing by the standard deviation of the control group.

The Difference Between Experimental Group Mean and Control Group Mean