Question: The first-order model E(y) = Î²0 + Î²1x1 was fit to n = 19 data points. A residual plot for the model is provided below.

The first-order model E(y) = Î²0 + Î²1x1 was fit to n = 19 data points. A residual plot for the model is provided below. Is the need for a quadratic term in the model evident from the residual plot? Explain.

1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 6 8 10 12 14 16 18 Residual

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