Cooling method for gas turbines. Refer to the Journal of Engineering for Gas Turbines and Power (January 2005) study of gas turbines augmented with high-pressure inlet fogging, Exercise 8.116 (p. 494). The data on engine heat rate (kilojoules per kilowatt per hour) are saved in the file. Recall that the researchers classified gas turbines into three categories: traditional, advanced, and aeroderivative. Suppose you want to compare the heat rate distributions for traditional and aeroderivative turbine engines.

a. Demonstrate that the assumptions required to compare the mean heat rates using a t-test are likely to be violated.

b. Conduct a nonparametric test to compare the two heat rate distributions.