Refer to the Journal of Engineering for Gas Turbines and Power (Jan. 2005) study of a high-pressure inlet fogging method for a gas turbine engine, presented in Exercise. Now consider the interaction model E(y) = β0 + β1x1 + β2x2 + β3x1x2 for heat rate (y) of a gas turbine as a function of cycle speed (x1) and cycle pressure ratio (x2). Use the data saved in the GASTURBINE file to conduct a complete residual analysis of the model. Do you recommend making modifications to the model?
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