To determine the average speed at which people are driving on I-66, researchers plan to measure the actual driving speeds of a sample of drivers on I-66.  From historical data, it is known that the standard deviation of speed on this highway is  9.5 MPH How large should the sample of  drivers be so that the average speed of men can be determined  with a margin of error of ±2.8 MPH and           96% confidence?

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To determine the average speed at which people are driving on I-66, researchers plan to measure the actual driving speeds of a sample of drivers on I-66.  From historical data, it is known that the standard deviation of speed on this highway is  9.5 MPH

How large should the sample of  drivers be so that the average speed of men can be determined  with a margin of error of ±2.8 MPH and           96% confidence?

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