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If I was to do a study to determine if one gender was better in math than another, I would first have to ensure the control groups were similar in almost every way other than gender. This study compares results between different cultures and this adds too many variables into the equation. You would also have to ensure as many factors as possible were the same between the male and females in the study. This is virtually impossible to guarantee.

Well, of course, this sort of thing is virtually never possible in the social sciences. wink Nevertheless, of course studies do control for such things as much as possible. But...neither of these studies are trying to PROVE that boys and girls are equal. Rather, they are trying to DISprove the Greater Male Variability Theory, which holds that it is a biologically immutable fact that boys have more variability in their math performance and are overrepresented in both tails of the bell curve. If this is true, then it should be true universally, since it's purportedly a biological, hard-wired difference. One's nation of origin should make no difference.