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The percent y of U.S. college freshmen who identified computer science as their probable field of study from 2001 to 2005 decreased in a pattern that was approximately parabolic. The least squares regression parabola y = at² + bt + c for the data is found by solving the system 5c + 15b + 55a = 9.7 15c + 55b + 225a = 23.9 55c +225b + 979a = 77.3 Let t represent the year, with t=1 corresponding to 2001.
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