The distribution of scores of males and females on a test of spatial ability presented in the textbook shows a d of .73 which indicates a size of effect that is considered

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A d of .73 indicates a large effect size. Cohen's d is typically interpreted as follows: 0.2 - small, 0.5 - medium, 0.8 - large. With a d of .73, the effect size is closer to large than to medium.

The Distribution of Scores of Males and Females on a Test