![]() The higher the expected conversion lift, the less traffic you need. As a rule, 5% significance level is used in mobile A/B testing. Put simply, it’s the percent of the time when a test proves your hypothesis when in reality this hypothesis is false. Significance level - the percent of the time the difference (MDE) will be detected, assuming it doesn’t exist.Normally, 80% is an optimal statistical power. Statistical power - the percent of the time when the minimum effect size is detected, assuming it exists.You calculate the sample size you need for a meaningful experiment with a specialized calculator using the above-mentioned variables and statistical power as well as significance level:.Minimum Detectable Effect (MDE) - the minimum expected conversion lift. ![]()
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