Just having a debate about this on another forum. The question is a matter of precision. It would be rather easy to tell the difference in intelligence between someone with a (measured) IQ of 60 and someone with a (measured) IQ of 120. And that without even having to define intelligence precisely. The problem is with differences that are a lot closer than that.

Between widely different IQ tests, there may be small variations in results, but generally, the results will be close. The precision of the results from the tests depends upon the precision of the definition of intelligence.

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