How big must the sample be for standard deviation

Reference no: EM13128837

You want to conduct a poll to see what kind of mileage a new model of pickup gets. You wish to be 95% confident and have an error of 0.4 mpg. The standard deviation is estimated at 1.8. How big must the sample be?

Reference no: EM13128837

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How big must the sample be for standard deviation : You wish to be 95% confident and have an error of 0.4 mpg. The standard deviation is estimated at 1.8. How big must the sample be?

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