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A recent survey found that 36% of teens aged 13-17 have a computer with Internet access...

A recent survey found that 36% of teens aged 13-17 have a computer with Internet access in their rooms. The study was based on a random sample of 400 teens and reported a margin of error of 0.03948.What level of confidence was used?
a)98
b)90
c)95
d)99
Math   Statistics-And-Probability   
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