I have only come across A/B test calculators that give the minimum sample size per variation for 50-50 split between control and treatment.
I am running an A/B test for conversion rates with a 80/20 split between control and treatment. I need to calculate the minimum sample size needed for statistical significance. Can anyone point me to the calculator that does so for uneven split between control and treatment?
Example calculator i have found so far :'https://www.evanmiller.org/ab-testing/sample-size.html' . This calculator is only for 50-50 split.