A confidence interval for the price of gasoline from a random sample of 30 gas stations in

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

y̅ = $1.29 SE(y) = $0.06

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?

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Business Statistics

ISBN: 9780133899122

3rd Canadian Edition

Authors: Norean D. Sharpe, Richard D. De Veaux, Paul F. Velleman, David Wright

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Question Posted: Jul 15, 2019 01:32 PM

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A confidence interval for the price of gasoline from a random sample of 30 gas stations in

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a The confidence interval equation is We need to find the critical tvalue be...View the full answer

Business Statistics

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