All new experiments now use t-tests for Frequentist statistics (experiments created before Oct 13, 2023 continue using z-tests).

You can configure key settings based on how critical your test is, including confidence level (95% or 99%), test type (two-tailed by default, one-tailed optional), and multiple comparison correction (Sidak, Bonferroni, or none).

To make setup easier, Sensible Defaults let you quickly apply recommended settings for standard or mission-critical experiments.

Learn more: https://support.convert.com/hc/en-us/articles/10157554451085-statistical-methods-used