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The principal at Riverside High School would like to estimate the mean length of time each day that it takes all the buses to arrive

The principal at Riverside High School 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 with90% confidence that the sample mean is offby, atmost, 7 minutes. Assume that s=14 minutes based on previous studies.

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