Question: When the model Y = 0 = 1x1 + 2x2 + 3x21 + 4x22 + 5x1x2 + is fit to the data of Exercise

When the model Y = β0 = β1x1 + β2x2 + β3x21 + β4x22 + β5x1x2 + ε is fit to the data of Exercise 49, the resulting value of SSE is 28.947. Given that the predictors x1, x2, and x1x2 remain in the model, does either of the quadratic predictors x21 or x22 provide additional useful information? State and test the appropriate hypotheses.

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