This is the number of people visiting your site thatcouldsee the change on a given day.

This is the percentage of your eligible visitors that currently complete your goal (e.g. purchasing or signing up).

This is the percent by which you predict you will change your base conversion rate. Use the minimum that would be worth the effort, or play with different values.

如果你95%自信的结果,这意味着that with 5% probability the observed difference is in fact due to chance.