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 a t-Test Between Dependent Means, and What Is an Example of How It Is Used?

### What Is a t-Test Between Dependent Means, and What Is an Example of How It Is Used?

A t-test between dependent means is used to test for the significance of differences between two averages from the same group. The obtained score is a function of subtracting one mean from the other and then dividing by an error term. This error term is made up of the amount of variance, or individual differences, within the same group across two different situations. The situations, for example, could be an assessment in September and one in May, two different treatments, or even two different forms of the same test. The key is that the same individuals are being tested. Basically, the larger the difference between the two ...