Refer to Exercise 12.11. Fit the following regression model to the data, where y is the systolic blood pressure, A is the age, and W is the weight of the infant.
y = 0 + β1A + β2W + β3A2 + b4W2 + ɛ
a. What are your conclusions about the overall fit of the quadratic model?
b. Conduct a test of the hypothesis that the second- order terms are needed in the model.
c. Does a second- or first- order model appear to be the more appropriate model? Justify your answer.
In exercise

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