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Data_Really_Matter t1_is9xa3j wrote

Hmmm. Let compare to groups that play chess, sports, study advanced math, read more books, etc ..

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Datapunkt t1_isak3nq wrote

I guess the historic control group didn't exclusively consist of children who were locked up in a basement their whole life. Other activities like playing chess might also increase their IQ.

The problems with the study are:

  • small sample size
  • children who enrolled in Mahjong classes might come from a more supportive family for some reason and therefore develop faster regardless.
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