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Confidence interval for the mean price of regular gasoline

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Reference no: EM131319232

A random sample of the price of gasoline from 20gas stations in a region gives the statistics below. Complete parts a) and b)

ybar = $3.59, s = $0.24

a) Find a 95% confidence interval for the mean price of regular gasoline in that region. __, __ (Round to three decimal places as needed.)

b) If we had the same statistics from a sample of 40 stations, what would the 95% confidence interval be now? __, __ (Round to three decimal places as needed.)

Reference no: EM131319232

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