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X out of Y binary events
Entry Nr. 12, by user 1
A poll. Out of Y people, X People answer with "Yes" and the rest answers "No". So the observed probability that a person answers "Yes" is X/Y

Based on the observed sample, what are the bounderies within which we expect the real probability that a random person answers "Yes"?
www.measuringusability.com/wald.htm Provides several methods to calculate the confidence intervall.
R In R type: prop.test(x,y)
Other websites about "X out of Y events"
faculty.vassar.edu/lowry/binomialX.html Javascript application for Binomial Probabilities