## What a Randomization Test Is and How to Run One in R

###### By Jim Lewis, PhD and Jeff Sauro, PhD . December 8, 2020 . Tags: R, t-test, Randomization, Rating Scale, Sample Size, Statistics

The two-sample t-test is one of the most widely used statistical tests, assessing whether mean differences between two samples are statistically significant. It can be used to compare two samples of many UX metrics, such as SUS scores, SEQ scores, and task times. The t-test, like most statistical tests, has certain requirements (assumptions) for its use. While it’s easy to conduct a two-sample t-test using