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by diminoten 2820 days ago
> a common IQ test ought to be able to be accurate to that

Accurate to what, even? The very notion of IQ is fuzzy, so naturally any test trying to measure the value would inherit that fuzziness.

The difference between 100 and 120 may be statistically identical to 99 and 99.99, but the practical difference is vastly different. At a certain point, the IQ test is "defeated", and any value above a certain threshold is nose.