Question: Consider the linear regression model from Exercise 12-4. Is the second-order term necessary in the regression model? Exercise 12-4 Hsuie, Ma, and Tsai (Separation and

Consider the linear regression model from Exercise 12-4. Is the second-order term necessary in the regression model?

Exercise 12-4

Hsuie, Ma, and Tsai (€˜€˜Separation and Characterizations of Thermotropic Copolyesters of p-Hydroxybenzoic Acid, Sebacic Acid, and Hydroquinone,€™€™ (1995, Vol. 56) studied the effect of the molar ratio of sebacic acid (the regressor) on the intrinsic viscosity of copolyesters (the response). The following display presents the data.

Ratio Viscosity 0.45 1.0 0.9 0.20 0.34 0.8 0.7 0.58 0.70 0.6 0.5 0.57 0.55 0.4 0.3 0.44

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