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

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Basic Math

Dylan Jones keptcareful records of the fuel efficiency of his new car. After thefirst twelve times he filled up the tank, he found the mean was22.9 miles per gallon (mpg) with a sample standard deviation of 1.2mpg.

  1. Compute the 98% confidence interval for his mpg. (Uset Distribution Table.) (Round your answers to 3decimal places.)

  1. How many times should he fill his gas tank to obtain a marginof error below 0.15 mpg? (Use z Distribution Table.)(Round your answer to the next whole number.)

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