Yep, that's a more precise version of what I was saying w.r.t. estimating sample size. I think the tool makes some assumption about variance, but the other 3 ar

Yep, that's a more precise version of what I was saying w.r.t. estimating sample size. I think the tool makes some assumption about variance, but the other 3 are things you supply. Note that I wasn't saying anything about the A/A test article, just the sample size estimator that's linked to.