A random sample of the price of gasoline from 20 gas stations in a region gives the statistics below.
Complete parts a) through c). y overbarequals$4.39, sequals$0.21
a) Find a95% confidence interval for the mean price of regular gasoline in that region.
b) Find the 90% confidence interval for the mean.
c) If we had the same statistics from a sample of 40stations, what would the 95% confidence interval be now?
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