Consider the data set in Exercise 9.12 and answer the
Chapter , Problem 9.14(choose chapter or problem)
Consider the data set in Exercise 9.12 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 Y = 0 + 1x1 + 2x2 + 12x1x2 + 11x2 1 + 22x2 2 + , and compare it to the one you chose in (a). Which is more appropriate? Use R2 adj as a criterion.
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