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TsviBT comments on 2012 Survey Results - Less Wrong
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It could be that many people self-reported IQ based off of their SAT or ACT scores, which would explain away the correlation. How many people reported both SAT and ACT scores?
If many people used the same formula to convert their SAT score to an IQ score, I expected the line would jump out, but I don't see anything like that on the scatterplot.
IQs are often multiples of 5. I think that is the result of IQ tests that do not aim for precision and that conversion charts would end in any digit. 56% of survey IQs are multiples of 5. For those reporting both IQ and SAT, the number is 59%, so it is not depressed (or inflated) by those doing conversions. If we remove the multiples of 5, the correlation drops to .2 and stops being statistically significant. But both scatterplots look pretty similar.
You mean either of the SATs?