Question: Refer to the NFL quarterback ratings data in Exercise 11-3. (a) Calculate R2 for this model and provide a practical interpretation of this quantity. (b)

Refer to the NFL quarterback ratings data in Exercise 11-3.

(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 the fitted values and against x.

Interpret these graphs.

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