Mathematics, 10.11.2020 17:00 murphyscott794

In order to estimate the mean monthly rental of the 300,000 31/2 room apartments for lower income housing in New York City a random sample of apartments is chosen and the rents are recorded. The housing authority wishes to be 95% certain that the error in estimating the mean monthly rental is less that $20. How many apartments should be in the sample? The standard deviation of rents is not known.

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