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Show all work How many commuters must be randomly selected to estimate the mean driving time...

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How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters? We want 90% confidence that the sample mean is within 4 minutes of the population mean, and the population standard deviation is known to be 12 minutes.

Math   Statistics-And-Probability   
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Answer #1

The sample size obtained is in fraction hence we take either 24 or 25 by rounding to nearset integer.

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