IQ and Global Inequality - Wikipedia, the free encyclopedia
Nation, 2000 measurement, 2006 measurement
Standard deviation of IQ scores is 15. 7 points of difference is indeed half a standard deviation. Accounting for Chinese, Indians, and Ashkenazi Jews in the US population, the actual US IQ may be more similar to that of Ireland at 92. In that case, the average American is indeed a retard compared to the average Chinese.