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You have a much better idea of conversion rate in the latter than the former. At least, thats what I take from the other website. I would like to use it, but I want to make sure it is accurate. If you visualize conversion rate ranges as a normal curves, then the overlap in 95 range constitutes a tiny area and thats why the resultant z-value becomes significant at 95 confidence level. If you define it as checking if variation is better than control (pvariation-pcontrol.