A/B Testing, Subtract the Statistics

TL;DR: You want to get started with A/B testing.
1. Pick a default scenario and a variant scenario.
2. Present 1 scenario to each customer at random. Record each customer and which was presented.
3. Go to this site.
4. Enter the number of customers and successes for each scenario and click “Submit”.
5. The confidence that the variant outperforms the default and the expected improvement are displayed.
6. If the expected…