A New York Times article reported that a survey conducted in 2014 included ​36,000 adults, with ​3.71% of them being regular users of​ e-cigarettes. Because​ e-cigarette use is relatively​ new, there...

A New York Times article reported that a survey conducted in 2014 included  ​36,000 adults, with ​3.71% 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 ​90% and a margin of error of 1 percentage  are​ wanted?

a. Assume that nothing is known about the rate of​ e-cigarette usage among adults.

n=?

b.. Use the results from the 2014 survey.

n=?

c.. Does the use of the result from the 2014 survey have much of an effect on the sample​ size?