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October 31, 2014

Posted by **aaron need urgent help** on Tuesday, October 20, 2009 at 12:44am.

The average price of a gallon of unleaded regular gasoline was reported to be $2.34 in northern Kentucky (The Cincinnati Enquirer, January 21, 2006). Use this price as the population mean, and assume the population standard deviation is $.20.

1) Calculate the sample size necessary to guarantee at least .95 probability that the sample mean is within $.03 of the population mean

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**MathGuru**, Thursday, October 22, 2009 at 9:57pmFormula:

n = [(z-value * sd)/E]^2

z-value = 1.96

sd = .20

E = .03

Plug the values into the formula and finish the calculation. Round your answer to the next highest whole number.

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**+9845**, Sunday, September 16, 2012 at 9:34pm170

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