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Kind of offtopic but regarding male-female intelligence differences - in Britain at least, girls seem to consistently outperform boys in school math exams, which would imply there is a mean difference, in the opposite direction.
It might, but there are subtleties you have to take into account. For example, ceiling effects will hide the claimed effect, and if there's not enough floor, can even produce a lower mean.
Imagine you have a test of 10 4-multiple-choice questions, male mean = female mean but males have higher variance, and the average student's score on the test would be 8, so lots of students score a perfect 10 but you would have to be retarded to score <=2. What will the mean by gender look like under this scenario? Since the male variance is higher, there will be seve... (read more)