Confidence intervals 1. The problem statement, all variables and given/known data[/ Use CLT to construct approximate symmetric 100(1-alpha)% confidence interval [L,R] for p then show that [L,1] is then an approximate 100(1-alpha/2)% confidence interval for p 3. The attempt at a solution When [L,1] then we have a one sided confidence interval. What we effectively need to show is that the area under the normal curve from -inf to alpha/2 is equal to the area under the curve from -inf to alpha/4 + the area under the curve from alpha/4 to inf I was going to look at the error function as a way to solve this. I havent managed it though. Any thoughts?