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A random sample of the price of gasoline from 20 gas stations in a region gives the statistics below: y = $3.59, s = $0.29

A random sample of the price of gasoline from 20 gas stations in a region gives the statistics below:

y = $3.59, s = $0.29

a) Find a 95% confidence level interval for the mean price of regular gasoline in that region

b) Find the90% confidence interval for the mean.

c) If we had the same statistics from a sample of 80 stations, what would the95% confidence interval benow?

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