Question: A. Compare the regression diagnostics (Studentized residual, leverage, and Cooks distance) computed in Problem 4.12 above with those obtained using a quadratic fit to the

A. Compare the regression diagnostics (Studentized residual, leverage, and Cook’s distance) computed in Problem 4.12 above with those obtained using a quadratic fit to the same data (see Problem 4.13). B.

Explain any differences.

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