Thread:User talk:WaitingforGodot/IQ tests/reply (17)

Well, it's been used to study the Flynn Effect, whereby IQ's gradually increase over time. It's been shown that certain racial demographics have lower IQs but probably owing to social rather than genetic factors. And they're made over many observations, so like a medical trial saying that homeopathy is bunk while paracetamol isn't so much, it's definitely a real effect. If the tests were random and useless, such effects wouldn't be seen at all.