This free online A/B test calculator shows if case A or case B is better. Moreover, it shows how sure it is that there is a real difference between the two cases and it’s not just the work of coincidence. Higher the certainty level, the more sureness for you about the fact that one is better than the other. Everyone needs to measure sureness, certainty, confidence of the results.
case B seems to be better than case A by 50%
Perhaps (86% chance) case B is somewhat better but you can't be sure.
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