CRITBINOM(trials,p,alpha)
trials: number of trials
p: probability of success in each trial
alpha: significance level (area of the tail)
If trials is a non-integer it is truncated. If trials < 0 this function returns a #NUM! error. If p < 0 or p > 1 this function returns a #NUM! error. If alpha < 0 or alpha > 1 this function returns a #NUM! error.
This function is Excel compatible.