There are a number of testing tools relying on this methodology. This is useful: Evan's Awesome A/B Tools (http://www.evanmiller.org/ab-testing/ http://www.evan

There are a number of testing tools relying on this methodology. This is useful: Evan's Awesome A/B Tools (http://www.evanmiller.org/ab-testing/ http://www.evanmiller.org/ab-testing/). It includes a Chi-Squared test, sample size calculator, two sample T-test, and Poisson Means test.