ความคิดเห็นที่ 6
As an economist, I think that it can only be concluded with proper regression analysis. However, I think that it will be extremely hard to find data (main variables like test score and parents' income .. not to say other controlling variables).
Anyway, I think there is quite a big experiment did in the US, to see the impact of class size on performance of students -- and they collect lot of data. You might be able to use that data to test your hypothesis.
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