Studies [1] have been done, and from what I can see at a cursory look most show a negative correlation, especially for female IQ. I think the disparity between

Studies [1] have been done, and from what I can see at a cursory look most show a negative correlation, especially for female IQ. I think the disparity between high income to low income counties in the US would show this relatively well. [1] https://www.gwern.net/docs/iq/2013-boutwell.pdf https://www.gwern.net/docs/iq/2013-boutwell.pdf