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A College Dean Wants to Determine the Average Time It

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A college dean wants to determine the average time it takes a student to get from one class to the next.Preliminary studies have shown that it is reasonable to let A college dean wants to determine the average time it takes a student to get from one class to the next.Preliminary studies have shown that it is reasonable to let <sub>t</sub> = 1.5 minutes the standard deviation of class travel times) .What is the sample size which should be examined if the dean wants to assert with a probability of 95 percent that his estimate, the mean time of the random sample, will not be off by more than .25 minutes in either direction) ? Choose the closest answer. A) 72 or more, but not less B) 81 or more, but not less C) 139 or more, but not less D) 200 or more, but not less E) None of the abovet = 1.5 minutes the standard deviation of class travel times) .What is the sample size which should be examined if the dean wants to assert with a probability of 95 percent that his estimate, the mean time of the random sample, will not be "off" by more than .25 minutes in either direction) ? Choose the closest answer.


A) 72 or more, but not less
B) 81 or more, but not less
C) 139 or more, but not less
D) 200 or more, but not less
E) None of the above

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