Abstract
First-year grade average was predicted from verbal and mathematical aptitude tests, standardized achievement tests in English, mathematics, and physics, and high school marks separately for males and females in order to study the sex differences in the predictability of academic achievement. The data came from five public universities, large and small, over a three-year period. A total of 141 pairs of correlations were tested for significance; 25 were significant at or beyond the.05 level. An attempt was made to explain the sex differences in terms of the characteristics of the samples of males and females who form the basis for prediction studies.

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