Confidence intervals and sample size. A confidence interval for the price of gasoline from a random sample

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Confidence intervals and sample size. A confidence interval for the price of gasoline from a random sample of 30 gas stations in a region gives the following statistics:

y = +4.49 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.

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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Business Statistics

ISBN: 9781292269313

4th Global Edition

Authors: Norean Sharpe, Richard De Veaux, Paul Velleman

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Question Posted: Sep 07, 2024 06:02 AM

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Confidence intervals and sample size. A confidence interval for the price of gasoline from a random sample

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Business Statistics

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