Power analysis is a process that involves evaluating a test’s statistical power to determine the necessary sample size for a hypothesis test. Learn more.

The birthday paradox is the probability theory that the probability of two people sharing the same birthday grows with the number of possible pairings.

The Kruskal-Wallis test is an important statistical analysis for data that doesn’t follow normal distributions. Our expert shows you how it works here.

Importance sampling is an approximation method that uses a mathematical transformation to take the average of all samples to estimate an expectation. Here’s how to do it.