Refer to Exercise 13.8.
a. Take as the response variable ty = log(y), the natural logarithm of the aphid count. Fit the model ty = β0 + β1x1 + β2x2 + ɛ to the aphid data.
b. Compare the fit of the quadratic model from Exercise 13.9 to the linear model fit in part (a) of this exercise.
c. Can we validly compare the R2adj values from these two models? Justify your answer.
In exercise

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