Question: Refer to the NFL team performance data in Exercise 11-4. (a) Calculate R2 for this model and provide a practical interpretation of this quantity. (b)

Refer to the NFL team performance data in Exercise 11-4.
(a) Calculate R2 for this model and provide a practical interpretation of this quantity.
(b) Prepare a normal probability plot of the residuals from the least squares model. Does the normality assumption seem to be satisfied?
(c) Plot the residuals versus and against x. Interpret these graphs.

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