The Principal at Riverside High School Would Like to Estimate

question 41

Multiple Choice

The principal at Riverside High School would like to estimate the mean length of time each day that it takes allthe buses to arrive and unload the students. How large a sample is needed if the principal would like to assertwith 90% confidence that the sample mean is off by, at most, 7 minutes. Assume that s = 14 minutes based onprevious studies.

• A) 11
• B) 10
• C) 12
• D) 13

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