Abstract
51 male and 45 female college students were given Rotter's I-E questionnaire and then allowed to volunteer to earn extra credit by attempting either a task for which supposedly skill determined outcome or one for which outcome supposedly was governed by chance. There was a significant correlation between I-E score and number of choices of skilled task. There was a non-significant difference between males' and females' I-E scores. An initially significant difference between males' and females' number of skill choices disappeared when the effect of differences in I-E scores was removed through analysis of covariance. Non-volunteers scored significantly more external than volunteers.