Refer to the data in Table 12-13 on order fulfillment time. (a) You decide to develop a

Question:

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

(a) You decide to develop a regression model using order value and the number of products in the order as predictors. Find the model equation. Is it significant at

α =0.05?

(b) Find R2 and R2a and comment relative to the model in Exercise 12-9.

(c) Is the predictor, number of products, significant in the presence of the other predictor? Test using α= 0.05.

(d) Find a 95% confidence interval for the mean fulfillment time for an order value of $75,000 and number of products being 65.

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