How many randomly selected car owners must survey

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Reference no: EM13151342

If several years pass and you want to conduct a new survey to estimate the mean length of time that car owners plan t keep their cars, how many randomly selected car owners must you survey? Assume that you want a 99% confidence that the sample mean is with 0.25 year (or 3 months) of the population mean, and also assume that 3.74 years.

Reference no: EM13151342

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