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Mathematics, 26.08.2019 21:20 jannadwhite2435

In order to officailly 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?

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In order to officailly bid on a contract, a contractor wants to be 95% confident that his error is l...
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