9. A flight test engineer endeavors to estimate the mean Mach Number of a par- ticular model aircraft. (Note: Mach Number = Aircraft Speed divided by the speed of sound, where the speed of sound is a function of altitude.) The en- gineer randomly selects and tests 11 of the targeted aircraft and records the Mach Number for each one, with M = 0.83 Mach and SD = 0.25. If we were to as- sume that the sample's distribution is near-normal in form, which of the follow- ing statements is correct? Assume all aircraft were tested at an altitude of 9,144 m (30,000 ft.).

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0.25 a. 95% CI for is 0.83 - -X2.228 11 0.25 b. 95% CI for is 0.83 x2.201 11 0.25 c. 95% CI for is 0.83 Ex 2.228 10 0.25 d. 95% CI for is 0.83 X2.201 10