Question: Consider the delivery time data in Example 3.1 . In Section 4.2.5 noted that these observations were collected in four cities, San Diego, Boston, Austin,

Consider the delivery time data in Example 3.1

. In Section 4.2.5 noted that these observations were collected in four cities, San Diego, Boston, Austin, and Minneapolis.

a. Develop a model that relates delivery time y to cases x1 , distance x2 , and the city in which the delivery was made. Estimate the parameters of the model.

b. Is there an indication that delivery site is an important variable?

c. Analyze the residuals from this model. What conclusions can you draw regarding model adequacy?

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