Refer to the context of the airline in Exercise 31 part (c). Assume that the estimated model

Question:

Refer to the context of the airline in Exercise 31 part (c). Assume that the estimated model meets the conditions for using the MRM for inference.
(a) Does the estimated multiple regression equation explain statistically significant variation in revenue among these feeder cities?
(b) If this model is used to predict revenue for a feeder city, how accurate would you expect those predictions to be?