Abstract
Previous research has shown the superiority of performance of males over that of females in solving Maier's horse trading problem. This investigation represented an attempt to reduce this sex difference by requiring Ss only to recognize the correct answer and its underlying reason. Consistent with earlier findings, 67.4% of the males and 34.2% of the females correctly solved the problem ( p < .01). Comparison with results of Hoffman and Maier (1961) suggests that the modified version of the problem had little effect on the percentage of males and females correctly solving the problem.

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