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In order to efciently bid on a contract, a contractor wants to be 99% condent that his error is less than three hours in estimating

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In order to efciently bid on a contract, a contractor wants to be 99% condent that his error is less than three hours in estimating the average time it takes to install tile flooring. Previous contracts indicate that the population standard deviation is 2.5 hours. HOW large a sample must be selected

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