A/B Testing
A/B testing is a controlled experiment for comparing two different versions of a single variable factor:
Tests used to evaluate experiment results include:
z-test - based on a normal distribution
t-test - based on a normal distribution if the value of a scaling term in the test statistic were known
chi-squared test - based on a chi-squared distribution
Multivariate testing is a version of A/B testing using more than two variants.