An article entitled ?oA Method for Improving the Accuracy of

An article entitled ?oA Method for Improving the Accuracy of

An article entitled ?oA Method for Improving the Accuracy of Polynomial Regression Analysis’’ in the Journal of Quality Technology (1971, pp. 149–155) reported the following data on y = ultimate shear strength of a rubber compound (psi) and x = cure temperature (°F).

(a) Fit a second-order polynomial to these data.
(b) Test for significance of regression using a = 0.05.
(c) Test the hypothesis that B11 = 0 using a = 0.05.
(d) Compute the residuals from part (a) and use them to evaluate model adequacy.

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