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Can you please explain? Thank you Airbnb hosts wish to learn the average length of stay of all visitors that are under the age of

Can you please explain? Thank you

Airbnb hosts wish to learn the average length of stay of all visitors that are under the age of 30. A statistician determines that to calculate a 95% confidence level estimate of the average length of stay to within +/- 1.5 days, a total of 95 young visitors' check-in/check-out records will have to be examined. How many records should be looked at to obtain a 95% confidence level estimate to within +/- 0.5 days?

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