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A mailed survey is to be conducted at a residential zone for trip production purposes. a.We estimate that the sample mean is 300 trips and

A mailed survey is to be conducted at a residential zone for trip production purposes. a.We estimate that the sample mean is 300 trips and the sample standard deviation is 60. We need to achieve 90% confidence in our results and an absolute error bound at +/- 15 trips. Estimate what is the sample size needed to achieve our goal?

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