Did you check the distributions of the individual tests by race? There could be floor effects for blacks.
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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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But perfectly possible in other societies. Our high tech society makes IQ80 the borderline for retardation
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Usual cutoff is 70, but Denmark uses 75. US military uses somewhere between 80 and 85. Makes you wonder about these data...
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