Dyan Jones kept careful records of the fuel efficiency of his new car. After the first 7 times he filled up the tank, he found the mean was 20.9 miles per gallon (mpg) with a sample standard deviation of 0.7 mpg. a) Compute the 95% confidence interval for his mpg. (Use T distribution table) (Round your answers to 3 decimal places) b) How many times should he fill his gas tank to obtain a margin of error below 0.10 mpg? (Use Z distribution table) (Round your answer to the next whole number).
Dyan Jones kept careful records of the fuel efficiency of his new car. After the first 7 times he filled up the tank, he found the mean was 20.9 miles per gallon (mpg) with a sample standard deviation of 0.7 mpg. a) Compute the 95% confidence interval for his mpg. (Use T distribution table) (Round your answers to 3 decimal places) b) How many times should he fill his gas tank to obtain a margin of error below 0.10 mpg? (Use Z distribution table) (Round your answer to the next whole number).
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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Dyan Jones kept careful records of the fuel efficiency of his new car. After the first 7 times he filled up the tank, he found the
a) Compute the 95% confidence interval for his mpg. (Use T distribution table) (Round your answers to 3 decimal places)
b) How many times should he fill his gas tank to obtain a margin of error below 0.10 mpg? (Use Z distribution table) (Round your answer to the next whole number).
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