Question 1092898
p hat is 20/225=0.089
95% CI is phat +/- 1.96* sqrt(p*(1-p))/n
half interval is 1.96+/- sqrt (0.089*0.911)/225); sqrt term = 0.0190, and product is 0.037
interval is (0.052, 0.126)
No, since every value in the interval is possible one may say that values below 5.2% would not be consistent nor values above 12.7%.  But the values between 5.2 and 8% are entirely feasible.