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A researcher with North County Transit wishes to estimate the mean one-way commute distance for students...

A researcher with North County Transit wishes to estimate the mean one-way commute distance for students who attend Palomar College. She wants to construct a 98% confidence interval for the distance to within 2 miles. How large of a sample must she take? Assume that commute distances are normally distributed with a standard deviation of 10.2 miles.

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Answer #1

Given x = 0.02 a/2=0.01 . r=10.2 Za/2=20326 Margin of error = 2 2 2012 un 2 = 2.326 10,2 un In = 23.7252 2 » n = 11.8626 n= 1

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