Question
A random sample of the price of gasoline from 30 gas stations in a region gives...
A random sample of the price of gasoline from 30 gas stations in a region gives the statistics below. Complete parts a through c below. y overbar =$4.39, SE left parenthesis y over bar right parenthesis = $0.06
a) Find a 95 % confidence interval for the mean price of regular 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.)
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