Those who read the news, either online or in print, would probably have seen this article: “Kids with tuition fare worse”.
In the article, it is claimed that: “In fact, children who received tuition actually scored about 0.256 standard deviations lower on their tests than those who did not (standard deviation is a measure of how spread out test scores are from the average).”
The headline is actually quite misleading, causing people to think that tuition causes worse performance. One needs to read the final part of the article: “The first is that students who receive tuition choose to receive it precisely because they are not doing well in school. In other words, weak performance may be what is driving students to enrol for tuition.”
The correct way to measure the effect of tuition is via a “before and after” experiment. Scores of students before and…
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