Question: An experiment was conducted to study the extrusion process of
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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