Refer to the data in Table 13-8 on order fulfillment time.

Table 13-8 

• You decide to develop a regression model using order value, the number of products, and the location of the retailer as predictors. Find the model equation. Is it significant at α = 0.05?

What is R² and interpret its value relative to that in Exercise 13-12, part (b).

• Are all the predictors significant in the presence of others? Use α = 0.05.

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

Interpret the model coefficients of that for location B.

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TABLE 13-8 Data on Time to Fulfill Order Number of Number of Time Value Products Location Time Value Products Location 12 42 35 13 45 38 A 14 51 58 A 8 43 42 10 40 30 C 15 46 46 16 54 65 A 19 65 80 A 21 85 88 22 80 65 В 18 50 70 C 16 55 60 A 26 93 88 В 20 70 80 C 22 96 90 В 24 92 75 В 10 35 30 C 21 88 80 A 17 55 62 A 23 90 70 В 15 48 65 A 21 92 85 В 14 45 40 C 17 52 55 16 50 62 A 13 38 46 C 24 85 95 В 18 54 64 20 91 84 В 24 90 80 A