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A random sample of the price of gasoline from 20 gas stations in a region gives...

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 40​stations, what would the​ 95% confidence interval be​ now?

Math   Statistics-And-Probability   
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