The U.S. Energy Information Administration (US EIA) reported that the average price for a gallon of regular gasoline is $2.62. The US EIA updates its estimates of average gas prices on a weekly basis. Assume the standard deviation is $0.25 for the price of a gallon of regular gasoline. The desired margin of error is $0.07. What is the appropriate sample size for the US EIA to use if they wish to report each of the following margins of error at 95% confidence? Hint: Sample Size for an Interval Estimate of a Population Mean (8.3) (za/2) n= E2