From a random sample of 48 days in a recent year, US gas prices had a sample mean value of $3.63 gal

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 Assume the population standard deviation is $0.21/gal. Find the 90% and 95 percent confidence levels for the population mean.

Apr 22nd, 2015

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Apr 22nd, 2015

thank you

Apr 22nd, 2015

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Apr 22nd, 2015
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