The expected conversion rate of the control group.
This can be obtained through a monitoring campaign or checking the historical data.
The minimum relative change in conversion rate you would like to be able to detect. Given a 10% baseline conversion rate and a 20% MDE, the minimum conversion rate of the test group you would like to be able to detect is 10% * (1 + 20%), i.e. 12%.
The number of all samples, including samples in both test and control group.
The probability of the test rejecting the null hypothesis (H0) when it is true.
The probability of the test rejecting the null hypothesis (H0) when the alternative hypothesis (H1) is true.