Because of the Popularity of Movies as an Entertainment Medium $\text { ? }$

Multiple Choice

Because of the popularity of movies as an entertainment medium for college students,you plan to do a national study of the average cost of a movie ticket.If you assume that $\text { ? }$
= $0.50,what sample size would you have to take to be 95% confident that your estimate was within $0.25 of the true mean ticket prices?

A) 15
B) 7
C) 8
D) 4
E) 16