Question: 3.12 Reconsider the data from Exercise 2.18. Suppose that we now wish to consider fitting a nonlinear model to these data, say, y = (a)

3.12 Reconsider the data from Exercise 2.18. Suppose that we now wish to consider fitting a nonlinear model to these data, say, y =

(a) Fit the nonlinear model to the data.

(b) Test for significance of regression.

(c) Does it appear that both of the design variables have important effects?

(d) Analyze the residuals and comment on model adequacy.

(e) Which model do you prefer, the linear model from Exercise 2.18 or the nonlinear model? Explain why.

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