Manage Your Statistical Confidence
In any experiment, the larger your sample size, the more accurate (and valuable) the results of the data will be.
Depending on your particular needs, you can adjust the minimum or maximum length that an experiment should run.
You can also ensure that your winning test starts running by itself after a certain percentage of statistical significance, as well as sitting a minimum number of visitors and conversions to trigger this change.
To do this, go to your Experiments tab and navigate to the Experiments Summary by clicking on the pen icon under "Actions":
Find and click on the text link that says 97% Confident (it may be a different percentage for you):
You'll see your range of options, like so:
Simply make your desired changes, then be sure to save.