Question: Cooling method for gas turbines. Refer to the Journal of Engineering for Gas Turbines and Power (Jan. 2005) study of gas turbines augmented with high-pressure inlet fogging, Exercise 7.23 (p. 397). Heat rate data (kilojoules per kilowatt per hour) for each of three types of gas turbines (advanced, aeroderivative, traditional) are saved in the GASTURBINE file. In order to compare the mean heat rates of two types of gas turbines, you assumed that the heat rate variances were equal.

1. Conduct a test (at \(\alpha=.05\) ) for equality of heat rate variances for traditional and aeroderivative augmented gas turbines. Use the result to make a statement about the validity of the inference derived in Exercise 7.23a.
2. Conduct a test (at \(\alpha=.05\) ) for equality of heat rate variances for advanced and aeroderivative augmented gas turbines. Use the result to make a statement about the validity of the inference derived in Exercise 7.23b.

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