Confidence and estimated standard deviation

Reference no: EM1312644

The Arkansas State Police wish to estimate the average mph being traveled on the Interstate Highways, which cross the state. If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph, how large a sample size must be taken?

A) 42

B) 15

C) 329

D) 14

Reference no: EM1312644

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