How large a sample is needed if the principal would like


The principal at Lakewood Elementary would like to estimate the mean length of time each day that it takes all the buses to arrive and unload the students. How large a sample is needed if the principal would like to assert with 90% confidence that the sample mean is off by, at most, 7 minutes. Assume σ = 14 minutes.

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Basic Statistics: How large a sample is needed if the principal would like
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