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Careful records of the fuel efficiency

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Dylan Jones kept careful records of the fuel efficiency of his new car. After the first eleven times he filled up the tank, he found the mean was 27.3 miles per gallon (mpg) with a sample standard deviation of 1.3 mpg. (Use t Distribution Table.)

a. Compute the 95% confidence interval for his mpg. (Round your answers to 3 decimal places.)

The confidence interval is between _____________ and _________.

b. How many times should he fill his gas tank to obtain a margin of error below 0.15 mpg? (Round up your answer to the next whole number.)

Reference no: EM132483580

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