Did you check the distributions of the individual tests by race? There could be floor effects for blacks.
The Black White IQ gap in the total sample of the Vietnam Experience Study. https://osf.io/7whv6 pic.twitter.com/H8O2HHgWPZ
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There are floor effects for both because of selection at admission. Stronger for Blacks due to lower mean.
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I talked to a psychologist today who said that a person with an IQ below 80 wouldn't be able to function in a modern society
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