(Solution) - Reconsider the NFL data in Exercise 12 4 a Find the amount -(2025 Original AI-Free Solution)

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Reconsider the NFL data in Exercise 12-4.
(a) Find the amount by which the regressor x8 (opponents? yards rushing) increases the regression sum of squares.
(b) Use the results from part (a) above and Exercise 12-14 to conduct an F-test for H0: B8 = 0 versus H1: B8 ( 0 using
a = 0.05. What is the P-value for this test? What conclusions can you draw?