The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder 3.5-L automatic 5-speed using premium
Question:
The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder 3.5-L automatic 5-speed using premium fuel is a normally distributed random variable with a mean of μ = 27.0 mpg and a standard deviation of σ = 1.25 mpg.
(a) What is the standard error of the mean from a random sample of 16 fill-ups by one driver?
(b) Within what interval would you expect the sample mean to fall, with 90 percent probability?
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Related Book For
Essential Statistics In Business And Economics
ISBN: 9781260239508
3rd Edition
Authors: David Doane, Lori Seward
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