Nah. Effects of class room composition are tiny. Read up on forced busing in the USA.
Racial gaps in cognitive ability in South Africa. Not sure why the White mean is so low. 370ish should correspond to roughly IQ 90 (assuming sd = 100, int mean as given). https://books.google.com/books?id=zULv_L1x_tMC&pg=PA101&lpg=PA101&dq=%22achievement+test%22+vietnam&source=bl&ots=07IjxWcjlk&sig=5A3WNcSTLNAgHqnwB9ZMitxRBcc&hl=en&sa=X&ved=0ahUKEwi179D-i_zYAhUMylMKHeCfBxkQ6AEIPDAF#v=onepage&q=%22achievement%20test%22%20vietnam&f=false …pic.twitter.com/0lqRPzFUiu
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Meh. Classroom effects are tiny or non-existent for cognitive outcomes. Nonexistent multiple times is still nothing. Read the twin control studies based on e.g. TEDS.
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Other samples from SA found White IQ close to 100. This result is anomalous, not the others.
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South Asians I guess.
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These kinds of things is why one needs genomic ancestry measures.
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What could be the most likely factor for this in your opinion?
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I have no opinion, did not check the source in detail.
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Maybe smarter whites attend private schools or schools in a particular district and so the sampling isn't representative. I've never gotten the impression that SA whites are uniformly bright.
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