A recent survey of U.S. teenage pregnancy was answered by 720 girls, age 12 - 19. 6% of the girls surveyed said they have been pregnant. (Parade Magazine) We are interested in the true proportion of U.S. girls, age 12 - 19, who have been pregnant.
Find the 95% confidence interval for the true proportion of U.S. girls, age 12 - 19, who have been pregnant.