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Suppose we are trying to model Y as a polynomial of X . Which of the following is NOT a valid reason to pick a

Suppose we are trying to modelYas a polynomial ofX. Which of the following is NOT a valid reason to pick a fourth-order polynomial over a third-order polynomial?

A The adjusted-R²is higher in the fourth-order polynomial model.

B We believe a model with a fourth-order polynomial in X captures the theoretical relationship between Y and X.

C The coefficient onX⁴is statistically significant.

D TheR²is higher in the fourth-order polynomial model.

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