# Lesson 54: Power of a Statistical Test

Whenever we conduct a hypothesis test, we'd like to make sure that it is a test of high quality. One way of quantifying the quality of a hypothesis test is to ensure that it is a "**powerful**" test. In this lesson, we'll learn what it means to have a powerful hypothesis test, as well as how we can determine the sample size *n* necessary to ensure that the hypothesis test we are conducting has high power.