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Hotel managers wish to learn the average length of stay of all visitors that are senior...

Hotel managers wish to learn the average length of stay of all visitors that are senior citizens. A statistician determines that for a 90% confidence level estimate of the average length of stay to within +/- 1.5 days, 65 senior visitors’ check-in/check-out records will have to be examined. How many records should be looked at to obtain a 90% confidence level estimate to within +/- 0.5 days?

Math   Statistics-And-Probability   
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TOPIC:Finding the required sample size for the given confidence level and the allowable margin of error.

Answer: 585.

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