An experiment was conducted to study the extrusion process of biodegradable packaging foam. Among the factors considered for their effect on the unit density (mg/ ml) were the die temperature (145° C versus 155° C) and the die diameter (3 mm versus 4 mm). The results were stored in PackagingFoam3 . (Data extracted from W. Y. Koh, K. M. Eskridge, and M. A. Hanna, “ Supersaturated Split Plot Designs,” Journal of Quality Technology, 45, January 2013, pp. 61– 72.) Develop a multiple regression model that uses die temperature and die diameter to predict the unit density (mg/ ml). Be sure to perform a thorough residual analysis. Do you think that you need to use both independent variables in the model? Explain.

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