Refer to the data in Table 12-13 on order fulfillment time.

(a) You decide to develop a regression model using order value, number of products, and location of the retailer as predictors. Find the model equation.

Is it significant at α= 0.05?

(b) What is R2 and interpret its value relative to that in Exercise 12-12, part (b).

(c) Are all the predictors significant in the presence of others? Use α= 0.05.

(d) What can you comment regarding the models for locations A and C?

(e) Interpret the model coefficients of that for location B.