Is IQ correlated with skin tone among blacks? The General Social Survey gave 437 blacks an IQ test (10 vocabulary words) and interviewers also recorded how dark their skin was from "very dark brown" to "very light brown." Here are the means:
Mean IQ by darkness of skin
Very dark brown 86.99
Dark brown 84.05
Medium brown 90.38
Light brown 92.77
Very light brown 90.99
All blacks 88.91
You might wonder why the mean is not 85 for all blacks--the black-white gap is not as large for verbal ability. Also--due to small samples, the only significant differences at the 95% level are medium and light over dark.
Dark and light browns are almost 9 points apart, a gap more than large enough to produce classes among blacks based on skin color. (Or the color-based classes produced the IQ gap?)
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