Question 1039096
1 sample proportion
ci is 1.96 sqrt{p(1-p)/n}
1.96*sqrt (1/5)(4/5)/1100}; the sqrt term is 0.0121
the interval is 0.0236
The CI is 0.20+/-0.0236
(0.1764,0.2236)
(17.64%,22.36%)