IQ

IQ differences are real, but do they matter?

The evidence is that IQ, as conventionally measured, does differ between racial groups. Many studies have shown differences of about 15 points between the mean scores of white and black groups, and some have shown that Chinese and Japanese groups score higher still.

A second argument - that IQ doesn't matter anyway -is easier to dismiss. A large body of evidence shows that IQ is linked to success in life, both educational and economic. This is why the gap narrows when corrections are made for socio-economic status, because in a mobile society success is largely determined by intelligence.