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In: Statistics and Probability

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). y overbarequals​$4.19​, sequals​$0.25 ​a) Find a 95​% confidence interval for the mean price of regular gasoline in that region. left parenthesis nothing comma nothing right parenthesis ​(Round to three decimal places as​ needed.) ​b) Find the​ 90% confidence interval for the mean. left parenthesis nothing comma nothing right parenthesis ​(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? left parenthesis nothing comma nothing right parenthesis ​(Round to three decimal places as​ needed.)

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Expert Solution

a)

b)

c)

orchestra answered 2 years ago
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