The following is default we use for calculating statistics. They can be modified in the Admin section as described in the link under (6) below.
Type 1 error thresholds:
When testing for the type 1 error we set the alpha (or significance) to 0.05.
Type 2 error thresholds:
When calculating the power of the experiment we use a type 2 error rate of 20% and enforce that by setting a sample size threshold that is calculated using the below settings as defaults.
- the alpha (or significance) = 0.05
- the statistical power or 1-beta = 0.8 where beta is 0.2
The effect size required is dependent on the sample size of your experiment.
Much more detail can be found in the Documentation: