The combined city/highway fuel economy of a 2016 Toyota 4Runner 2WD 6-cylinder 4-L automatic 5-speed using regular

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The combined city/highway fuel economy of a 2016 Toyota 4Runner 2WD 6-cylinder 4-L automatic 5-speed using regular gas is a normally distributed random variable with a range 17 mpg to 22 mpg.

(a) Estimate the standard deviation using Method 3 (the Empirical Rule for a normal distribution) from Table 8.11.

(b) What sample size is needed to estimate the mean with 90 percent confidence and an error of ±0.25 mpg?

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Essential Statistics In Business And Economics

ISBN: 9781260239508

3rd Edition

Authors: David Doane, Lori Seward

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Question Posted: Oct 11, 2019 08:40 AM

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The combined city/highway fuel economy of a 2016 Toyota 4Runner 2WD 6-cylinder 4-L automatic 5-speed using regular

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Essential Statistics In Business And Economics

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