Question: Refer to Exercise 13 21 An additional regression model for the

Refer to Exercise 13.21. An additional regression model for the snack cracker data is run, incorporating products of the promotion variable with price and with category sales. The output for this model is given in the figure. What effect do the product term coefficients have in predicting sales when there is a promotion by a competing brand? In particular, do these coefficients affect the intercept of the model or the slopes?
In exercise

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