We survey 1004 teens age 13-19, we record whether or not they have had sex education. 817 respond that they have had some form of sex education. (a) Construct a 99% confidence interval for teens who...

We survey 1004 teens age 13-19, we record whether or not they have had sex education. 817 respond that they have had some form of sex education.

(a)  Construct a 99% confidence interval for teens who have not had sex education.

(b)  How many teens would we have to sample in order to cut the margin of error in half?