Race, ethnicity, and IQ according to ADD Health

The ADD Health Study gave teenagers a five minute vocabulary test and converted scores into a measure of IQ. (As a reader pointed out in an earlier post, vocabulary accurately captures general intelligence). Here are mean IQ scores for all kids who were born in the United States (non-Hispanic whites are set at 100, and the standard deviation is 15):

Jews are heads and shoulders above other groups. Jews and blacks, in fact, are 1 1/2 standard deviations apart--an enormous difference. Except for Koreans, all Asian groups score lower than whites, and Filipinos are toward the bottom of the list. All Hispanic groups have lower averages. Mexican Americans are nine points lower than whites.