Question: how to calculate 95 confidence interval for binomial distribution?
Answer: where p = proportion of interest.
n = sample size.
α = desired confidence.
z1- α/2 = “z value” for desired level of confidence.
z1- α/2 = 1.96 for 95% confidence.
z1- α/2 = 2.57 for 99% confidence.
z1- α/2 = 3 for 99.73% confidence.