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Sure... But it's a DIFFERENT TEST, on a different population of people, with the goal of measuring military-specific factors.
And if low iq folks are more likely to seek enlistment, the distribution could be significantly lower than iq/the population at large.
Yes, there is absolutely a sampling bias here
There are probably ways to correlate the military test with a standardized IQ test, and which point the military test might be a rough proxy for IQ. If that was the case, the 80 IQ rule might be roughly accurate.
I don't know if that's been done though. Just playing devil's advocate.
I think there have been studies on the correlation between ASVAB scores and IQ scores. The correlation is supposedly 0.8.
This stack exchange post has a few sources linked
https://psychology.stackexchange.com/questions/20220/to-what-extent-does-afqt-correlate-with-iq