Dylan Jones kept careful records of the fuel efficiency of his new car. After the first nine

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Dylan Jones kept careful records of the fuel efficiency of his new car. After the first nine times he filled up the tank, he found the mean was 23.4 miles per gallon (mpg) with a sample standard deviation of 0.9 mpg.

a. Compute the 95% confidence interval for his mpg.

b. How many times should he fill his gas tank to obtain a margin of error below 0.1 mpg?

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Statistical Techniques in Business and Economics

ISBN: 978-0078020520

16th edition

Authors: Douglas Lind, William Marchal

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Question Posted: Dec 10, 2014 07:48 AM

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Dylan Jones kept careful records of the fuel efficiency of his new car. After the first nine

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