Question

2. Panama City Airways engine shop performs overhauls on the airline's fleet of Pratt & Whitney JT8D engines. The average TBO for the fleet has been 5630 hours. 5 years ago the airline acquired 32 engines having "single crystal" high-pressure turbine blades. All of these engines have now made it through overhaul and the TBO for these "single crystal" engines was found to be 5426 hours with a standard deviation of 642 hours. Using a 1% significance level test the claim that the new type of turbine blades have reduced engine service life.

Answer 1

# 2. TBO= x 7 25426 M. 5630 52.642 , 0232 clotto: M=5630 vs Has u <5630 (1) a= 1% Cool level of significance (h) The test storstic t= sorry =5426-5630 df-n-1229 tal-17909 (-107975 (642 ) Cr) p-value 2 lorous Cove Can Conchple Rat newblades D ondission. & Rail to reject the does not redused engine ser 391