Question: The first-order model E1y2 = b0 + b1 x1 was fit to n = 19 data points. A plot of the residuals of the model

The first-order model E1y2 = b0 + b1 x1 was fit to n = 19 data points. A plot of the residuals of the model is shown.

Is the need for a quadratic term in the model evident from the plot? Explain.

Residual 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 0 2 4 6

Residual 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 0 2 4 6 8 10 12 14 16 18 =

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