Consider the data set in Exercise 14.12 and answer the following questions.(a) Both factors of 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 x = copper content and x2 = time.Fit the model to the data, showing regression coefficients and an i-test on each.(b) Fit the model and compare it to the one you chose in (a) which is more appropriate? Use R2adj as acriterion.

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Y = Bo + B11 + 32x2 B1201r2 + Buai + B2+ €,