A New York Times article reported that a survey conducted in 2014 included 36,000 ​adults, with 3.69​% of them being regular users of​ e-cigarettes. Because​ e-cigarette use is relatively​ new, there is a need to obtain​ today's usage rate. How many adults must be surveyed now if a confidence level of 95​% and a margin of error of 2.5 percentage points are​ wanted? a. Assume that nothing is known about the rate of​ e-cigarette usage among adults.

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