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 8.8. (Round your answer to 4 decimal places.) Standard deviation (b) What sample size is needed to estimate the mean with 90 percent confidence and an error of ± 0.25 mpg? (Enter your answer as a whole number. Use a z-value taken to three decimal places in your calculations.) Sample size
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 8.8. (Round your answer to 4 decimal places.) Standard deviation (b) What sample size is needed to estimate the mean with 90 percent confidence and an error of ± 0.25 mpg? (Enter your answer as a whole number. Use a z-value taken to three decimal places in your calculations.) Sample size
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text: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 8.8. (Round your answer to
4 decimal places.)
Standard deviation
(b) What sample size is needed to estimate the mean with 90 percent confidence and an error of ± 0.25 mpg? (Enter your answer as a
whole number. Use a z-value taken to three decimal places in your calculations.)
Sample size
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