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Statistics for Business and Economics | 12th Edition | ISBN: 9780321826237 | Authors: James T. McClave, P. George Benson, Terry T Sincich
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Cooling method for gas turbines. Refer to the Journal

Chapter 12, Problem 29E

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QUESTION:

Problem 29E

Cooling method for gas turbines. Refer to the Journal ofEngineering for Gas Turbines and Power (Jan. 2005) studyof a high-pressure inlet fogging method for a gas turbineengine, Exercise 12.19 (p. 683). Recall that you fit a firstorder model for heat rate (y) as a function of speed (x1),inlet temperature (x2), exhaust temperature (x3), cycle pressure ratio (x4), and airflow rate (x5). A Minitab printout withboth a 95% confidence interval for E(y) and predictioninterval for y for selected values of the x’s is shown below.

a. Interpret the 95% prediction interval for y in the wordsof the problem.

b. Interpret the 95% confidence interval for E(y) in thewords of the problem.

c. Will the confidence interval for E(y) always be narrower than the prediction interval for y? Explain.

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QUESTION:

Problem 29E

Cooling method for gas turbines. Refer to the Journal ofEngineering for Gas Turbines and Power (Jan. 2005) studyof a high-pressure inlet fogging method for a gas turbineengine, Exercise 12.19 (p. 683). Recall that you fit a firstorder model for heat rate (y) as a function of speed (x1),inlet temperature (x2), exhaust temperature (x3), cycle pressure ratio (x4), and airflow rate (x5). A Minitab printout withboth a 95% confidence interval for E(y) and predictioninterval for y for selected values of the x’s is shown below.

a. Interpret the 95% prediction interval for y in the wordsof the problem.

b. Interpret the 95% confidence interval for E(y) in thewords of the problem.

c. Will the confidence interval for E(y) always be narrower than the prediction interval for y? Explain.

ANSWER:

Step 1 of 4

Minitab Output For GASTURBINE file:

   

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