SOLUTION: the population standard deviation fro a gas mileage for a certain model of car is known to be 1.8 miles per gallon. how many cars would you have to test(what sample would you need)

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Question 857153: the population standard deviation fro a gas mileage for a certain model of car is known to be 1.8 miles per gallon. how many cars would you have to test(what sample would you need)to get a margin of error of 0.5 mile per gallon (or less) for the population mean at a 90%confidence level?
Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!
 

Hi,

90%	z =1.645

92%	z = 1.751

95%	z = 1.96

98%	z = 2.326

99%	z = 2.576

ME = .5 =

  sqrt(n) = 1.645*1.8/.5 = 5.922   

       n= 35.07 0r  approximately 36 

 

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