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Suppose that you are interested in estimating the average price of two-storey houses in Calgary. Suppose that the standard deviation of prices of two-storey houses

Suppose that you are interested in estimating the average price of two-storey houses in Calgary. Suppose that the standard deviation of prices of two-storey houses is known to be $72,500 in the population. How large of a sample is needed to ensure that the average price in the population is estimated with a margin of error of $10,000 with 99% level of confidence

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