Question

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.

ÿ= 3.49. s=$0.29

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

b) Find the​ 90% confidence interval for the mean.

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