In an increasingly data-driven world, it is more important than ever for students as well as professionals to better understand basic statistical concepts. 100 Questions (and Answers) About Statistics addresses the essential questions that students ask about statistics in a concise and accessible way. It is perfect for instructors, students, and practitioners as a supplement to more comprehensive materials, or as a desk reference with quick answers to the most frequently asked questions.

# What Is Analysis of Covariance (ANCOVA), and How Is It Used?

### What Is Analysis of Covariance (ANCOVA), and How Is It Used?

Analysis of covariance (ANCOVA) is particularly interesting because it basically allows you to equalize initial differences between groups. Let’s say you are sponsoring a program to increase running speed and want to compare how fast two groups of athletes can run a 100-yard dash. Because strength is often related to speed, you have to make some correction so that initial strength does not account for any differences at the end of the program. Rather, you want to see the effects of training with strength controlled. You would measure participants’ strength before you started the training program and then use ANCOVA to adjust final speed based on initial strength.

Michaela Hynie, John Lyndon, and Ali ...