Question: Consider the data set in Exercise 14.12 and answer the following questions. (a) Both factors, copper and time, are quantitative in nature. As a result,

Consider the data set in Exercise 14.12 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

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