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This is just a statistical weakness - basically, you would need students that got the exact same range of scores on the SAT, from the exact same socioeconomic background, half at a private school, half at a public school, taking the exact same courses, taught exactly the same way, and only graded differently.
Studies are nice and can offer some insight, but there are too many variables and not enough constants for anything like this to be a definitive answer as to whether or not private schools inflate grades more than public schools.
I would also like to see data on how many students "work their way" through college at both private and public universities, contrasted with with number of students that did it back in the fifties. Logically, it would seem that if a student did not have a job during school, their grades would be higher, because they had one less commitment pulling them away from others.
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