You want to estimate the average gas price in your city for a litre of regular unleaded gasoline with 90% confidence.You believe that the standard deviation of prices is $0.04.If you wish to achieve a margin of error no larger than $0.02,how many gas stations should you sample?
A) 13
B) 11
C) 12
D) 14
E) 10
Correct Answer:
Verified
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