# Question

Refer to Exercise 13.74.

a. Fit the data to the model of Exercise 13.74.

b. Give separate regression models for each of the laboratories.

c. How do these regression models compare to the previous regression equations for the laboratories?

d. What advantage(s) might there be to fitting a single model rather than separate models for the laboratories?

a. Fit the data to the model of Exercise 13.74.

b. Give separate regression models for each of the laboratories.

c. How do these regression models compare to the previous regression equations for the laboratories?

d. What advantage(s) might there be to fitting a single model rather than separate models for the laboratories?

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