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Problem 1
The least squares line for the relationship between the number of absences for a student and the student’s final grade from problem 31 was y-hat = -2.67X + 96.78. Find the 95% confidence interval for an average student’s final grade given that the student was absent 7 times (n = 6, x-bar = 6.167, SSxx = 108.8333, S = 2.775554).