study: rural chinese score 88.95 on the ravens non-verbal iq test, over one standard deviation lower than the commonly cited chinese iq of 105. study also finds that iq was a better predictor of math achievement than all environmental and demographic variables. so, the theory that chinese average iq is overinflated due to biased sampling turned out to be true. source:   2/11/30/race-and-iq-news-new-studie s/
United States