Question: In order to efficiently bid on a contract, a contractor wants to be 95% confident that his error is within 1.3 hours in estimating the

In order to efficiently bid on a contract, a contractor wants to be 95% confident that his error is within 1.3 hours in estimating the average time it takes to install tile flooring. By studying all previous contracts they indicate that the standard deviation is 2.1hours.

How large a sample must be selected?

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