Question 886331
as best i can determine, your answer will be as follows:


p = probability of success
q = probability of failure
n = sample size
sep = standard error of a proportion
czf = critical z factor
moe = margin of error
ci = confidence interval


p = .420
q = 1 - p = .580
n = 50
sep = sqrt (p*q/n) = sqrt(.004872) = .0698
czf = 1.96
moe = czf * se = 1.96 * .0698 = .1368
ci = p +/- moe = .420 +/- .1368 = .2832 to .5568