A random sample of the price of gasoline from 30 gas stations ina region gives the statistics below. Complete parts a through cbelow.
y=​ $3.89​, SE (y) =​$0.06
​a) Find a 95​% confidence interval for the mean price ofregular gasoline in that region.
​(Round to three decimal places as​ needed.)
​b) Find the​ 90% confidence interval for the mean.
​(Round to three decimal places as​ needed.)
​c) If we had the same statistics from a sample of 60​stations,what would the​ 95% confidence interval be​ now?
​(Round to three decimal places as​ needed.)
