by Patrick Appel
[T]here seems to be very little evidence to support Babcock's conclusion that study time has decreased even at selective schools by 10 hours from the 1960s to modern day. That is, he has a survey from 1961 in which students studied 25 hrs/week, two surveys in the 1980s in which students studied 17 hours/week, and two surveys in the 2000s in which students studied 14-15 hrs/week, but these surveys are all based on different types of students at different schools, so it's hard to make any strong conclusions. If I compared the weight of football [players] from Oberlin in 1930 and Ohio State in 2005, I'd find a great increase in weight, but in fact the weight of football players at Oberlin probably has not increased much over that time period.
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