"....the evidence that brain size is correlated with intelligence, and that blacks have smaller brains than whites. But the brain size difference between men and women is substantially greater than that between blacks and whites, yet men and women score the same, on average, on I.Q. tests. Likewise, a group of people in a community in Ecuador have a genetic anomaly that produces extremely small head sizes — and hence brain sizes. Yet their intelligence is as high as that of their unaffected relatives."
If IQ tests are flawed, how can you trust the IQ tests which show that men and women score the same on average?
BTW, there are also differences between the male and female brain, on average. Men do better in spatial reasoning, women in verbal conceptualization.