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

Dylan Jones kept careful records of the fuel efficiency of his new car. After the first ten times he filled up the tank, he found the mean was 25.3 miles per gallon (mpg) with a sample standard deviation of 0.8 mpg.

1) Compute the 90% confidence interval for his mpg. (Round your answers to 3 decimal places.)

The confidence interval is between ___ and ___.

2) How many times should he fill his gas tank to obtain a margin of error below 0.05 mpg? (Round up your answer to the next whole number.)

Sample Size ___

Math   Statistics-And-Probability   
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