A random sample of the price of gasoline from 20gas stations in a region gives the statistics below. Complete parts a) and b)
ybar = $3.59, s = $0.24
a) Find a 95% confidence interval for the mean price of regular gasoline in that region. __, __ (Round to three decimal places as needed.)
b) If we had the same statistics from a sample of 40 stations, what would the 95% confidence interval be now? __, __ (Round to three decimal places as needed.)