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 = 25.25 mpg and a standard deviation of σ = 2.00 mpg. (a) What is the standard error of X⎯⎯⎯X¯ , the mean from a random sample of 9 fill-ups by one driver? (Round your answer to 4 decimal places.) Standard error of X⎯⎯⎯X¯ _________ (b) Within what interval would you expect the sample mean to fall, with 95 percent probability? (Round your answers to 4 decimal places.) The interval is from ________ to _________
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 = 25.25 mpg and a standard deviation of σ = 2.00 mpg. (a) What is the standard error of X⎯⎯⎯X¯ , the mean from a random sample of 9 fill-ups by one driver? (Round your answer to 4 decimal places.) Standard error of X⎯⎯⎯X¯ _________ (b) Within what interval would you expect the sample mean to fall, with 95 percent probability? (Round your answers to 4 decimal places.) The interval is from ________ to _________
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 4CYU
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The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder 3.5-L automatic 5-speed using premium fuel is a
(a) What is the standard error of X⎯⎯⎯X¯ , the mean from a random sample of 9 fill-ups by one driver? (Round your answer to 4 decimal places.)
Standard error of X⎯⎯⎯X¯ _________
(b) Within what interval would you expect the sample mean to fall, with 95 percent probability? (Round your answers to 4 decimal places.)
The interval is from ________ to _________
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