18. Confidence intervals and sample size, part 2. A confidence interval for the price of gasoline from
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18. Confidence intervals and sample size, part 2. A confidence interval for the price of gasoline from a random sample of 30 gas stations in a region gives the following statistics:
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.
c) If we had the same statistics from a sample of 60 stations, what would the 95% confidence interval be now?
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Related Book For 
Business Statistics
ISBN: 9780321716095
2nd Edition
Authors: Norean D. Sharpe, Paul F. Velleman, David Bock, Norean Radke Sharpe
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