A Statistics Professor Asked Her Students Whether or Not They $\pm 4 \%$

Essay

A statistics professor asked her students whether or not they were registered to vote. In a sample of 50 of her students
(randomly sampled from her 700 students), 35 said they were registered to vote.
-If the professor only knew the information from the September 2004 Gallup poll and
wanted to estimate the percentage of her students who were registered to vote to within $\pm 4 \%$
th 95% confidence, how many students should she sample?