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The city housing department wants to estimate the average rent for rent-controlled apartments. They need to...

The city housing department wants to estimate the average 
rent for rent-controlled apartments. They need to determine 
the number of renters to include in the survey in order to 
estimate the average rent to within $50 using a 95% confidence 
interval. From past results, the variability in rent for these 
apartments was estimated at s=$325. How many renters are 
needed in the survey to meet the requirements?
math   Statistics-And-Probability   
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