Texas Passed a Law Requiring Drivers and Passengers in the Front

Short Answer

Texas passed a law requiring drivers and passengers in the front seat to wear seat belts.In order to estimate the compliance with the law an unmarked car will operate in a selected county and the officer will observe whether or not seat belts are in use.The proportion complying, $\pi$ ,in the county is to be estimated by randomly selecting the cars to examine.A confidence coefficient of 0.98 is desired with the estimate,p,to be within 0.05 of the true proportion.If an average number of cars passing the observation point per day is 12,000,how many cars are needed in this sample?