Try
where n= 200 and p = 20/200
Suppose the number of successes in n=200 binomial trials is 20.
a) Find a 90% confidence interval for p, the probability of success at each trial.
b) Find a 98% CI to p. Why is this interval wider than the previous one?
I know how to construct an confidence interval if given the n, s, and x bar, but how do I do it with this question?