Mathematics, 21.08.2019 21:30 angela613972

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? don't just give the answer - show work and explain your process each step of the way so that i can follow what you did and check your work.

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