11.S13 An article in the Journal of Applied Polymer Sci- ence [“Preparation and Characterizations of Thermotropic Copolyesters of p-Hydroxybenzoic Acid, Sebacic Acid, and Hydroquinone" (1995, Vol. 56, pp. 471–476)] reported on a study of the effect of the mole ratio of sebacic acid on the intrinsic vis- cosity of copolyesters. The data follow: Mole ratio x 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 Viscosity y 0.45 0.20 0.34 0.58 0.70 0.57 0.55 0.44 a. Construct a scatter diagram of the data. b. Fit a simple linear repression model. c. Test for significance of regression. Calculate R² for the model.

11.S13 An article in the Journal of Applied Polymer Sci- ence [“Preparation and Characterizations of Thermotropic Copolyesters of p-Hydroxybenzoic Acid, Sebacic Acid, and Hydroquinone" (1995, Vol. 56, pp. 471–476)] reported on a study of the effect of the mole ratio of sebacic acid on the intrinsic vis- cosity of copolyesters. The data follow: Mole ratio x 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 Viscosity y 0.45 0.20 0.34 0.58 0.70 0.57 0.55 0.44 a. Construct a scatter diagram of the data. b. Fit a simple linear repression model. c. Test for significance of regression. Calculate R² for the model.

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11.S13 An article in the Journal of Applied Polymer Sci-
ence ["Preparation and Characterizations of Thermotropic
Copolyesters of p-Hydroxybenzoic Acid, Sebacic Acid, and
Hydroquinone" (1995, Vol. 56, pp. 471–476)] reported on a study
of the effect of the mole ratio of sebacic acid on the intrinsic vis-
cosity of copolyesters. The data follow:
Mole ratio x 1.O
0.9
0.8
0.7
0.6
0.5
0.4
0.3
Viscosity y 0.45 0.20 0.34 0.58 0.70 0.57 0.55 0.44
a. Construct a scatter diagram of the data.
b. Fit a simple linear repression model.
c. Test for significance of regression. Calculate R² for the
model.
d. Analyze the residuals and comment on model adequacy.

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