Question: 14.14 Consider the data set in Exercise 14.10 and answer the following questions. (a) Both factors, copper and time, are quantitative in nature. As a

14.14 Consider the data set in Exercise 14.10 and answer the following questions.

(a) Both factors, copper and time, are quantitative in nature. As a result, a regression model may be of interest. Describe what might be an appropriate model using x1 = copper content and x2 = time.

Fit the model to the data, showing regression coefficients and a t-test on each.

(b) Fit the model Y = β0 + β1x1 + β2x2 + β12x1x2

+ β11x21

+ β22x22

+ , and compare it to the one you chose in (a). Which is more appropriate? Use R2 adj as a criterion.

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