It turns out you do need to know some math to work in user experience. Being in UX means that sooner or later you’re going to have to deal with data on user performance or satisfaction, typically from a usability test. Even if you restrict yourself to design and leave the user research to others, you’re going to have to review the results of user research to inform your design work, so you’re going to need some concepts for evaluating that data. Specifically, you need to know a thing or two about inferential statistics, the branch of statistics that helps you determine what you can reasonably conclude about your population of users based on what you’re seeing in your sample of users.

What every user experience professional needs to know about statistics and usability tests.