Question: Refer to Exercise 13.9. a. What is the incremental increase to R2 for the model of Exercise 13.8 as opposed to the model considered in

Refer to Exercise 13.9.
a. What is the incremental increase to R2 for the model of Exercise 13.8 as opposed to the model considered in part (a) of Exercise 13.9?
b. Is this incremental increase statistically significant as measured by an F test at a 5 .05?

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