Question: In order to efficiently bid on a contract a contractor wants to be 95 confident that his error is less than two hours in estimating

In order to efficiently bid on a contract a contractor wants

In order to efficiently bid on a contract a contractor wants to be 95 confident that his error is less than two hours in estimating the average time it takes to install tile flooring Previous contracts indicate that the standard deviation is 4 5 hours How large a sample must be selected 20

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