Let's say that a consumer group wants to estimate what the mean of the electric bill for the month of July is for a single family homes in a big city. According to studies conducted in other cities, the standard deviation is said to be twenty five dollars. The group wants to estimate, with a 99% confidence. The mean bill for July to within ±5.00, then what sample size is needed?

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Let's say that a consumer group wants to estimate what the mean of the electric bill for the month of July is for a single family homes in a big city. According to studies conducted in other cities, the standard deviation is said to be twenty five dollars. The group wants to estimate, with a 99% confidence. The mean bill for July to within ±5.00, then what sample size is needed? 

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