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buybuydandavis comments on LessWrong IQ Survey - Less Wrong
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The OP referred to the SAT/ACT score averages as 0.11%, giving 3sigma+, while the IQ numbers averages I saw were 140 to 146, being almost 3sigma.
Certainly this data set isn't equally useful to everyone, but I think significantly useful to many. It depends on how significant intelligence level is in life. Out at 3sigma and beyond, I'd think pretty significant. I wouldn't expect that estimate to be universal, but I would expect it to get at least a good plurality.
OK, so "between 120 and 140" was on the low side. That's not the point; the point is that whatever measure you pick, the remaining uncertainty about the mean is less than the known variation between people.