Abstract
Contrary to one common interpretation, analysis of high-school discussion classes revealed no "male predominance" in rate of participation or weight of contribution. On all indices male and female students participated in proportion to their numbers in class, both overall and at each level of male-female enrollment. Sex differences in participation might thus be explained by the factor of male-female representation in class rather than by sociocultural traits attributed to the sexes. When each sex speaks in proportion to its numbers present, the differences may rather be viewed as similarities in participation.