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Mileage tests are conducted for a particular model of automobile. If a 95%confidence interval with a margin of error of 1mile per gallon is desired,
Mileage tests are conducted for a particular model of automobile. If a 95%confidence interval with a margin of error of 1mile per gallon is desired, how many automobiles should be used in the test? Assume that preliminary mileage tests indicate the standard deviation is 2.9miles per gallon. Round your answer up to the nearest whole number.
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