Cooling method for gas turbines. 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 12.27 (p. 701). Now consider the interaction model E1y2 = b0 + b1 x1 + b2 x2 + b3 x1 x2 for heat rate (y) of a gas turbine as a function of cycle speed 1x12 and cycle pressure ratio 1x22. Use the data to conduct a complete residual analysis of the model. Do you recommend making modifications to the model?