How large a sample should the CE take to be 90% confident of his estimate?

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Question description

A civil engineer wishes to estimate the average completion time of freeway widening projects correct to within 1 month. From previous experiments it is known that the population standard deviation is approximately 6 months. How large a sample should the civil engineer take to be 90% confident of his estimate?

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(Top Tutor) Daniel C.
School: New York University
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