Average cost of a gallon of fuel was reported to be $2.41. During the changes, the newpaper sample service stations and report prices. Assume the population standard deviation is $0.15 for the price of fuel per gallon. What is the sample size the newpaper should use, with 95% confidence.
1.) if the desired margin of error is $0.07
2.) if the desired margin of error is $0.05
3.)if the desired margin of error is $0.03
1.) if the desired margin of error is $0.07
2.) if the desired margin of error is $0.05
3.)if the desired margin of error is $0.03
