# Chapter 8: Examining Differences between Means: The t-test

**Learning Objective:**

- Introduce the t-test – a statistical procedure that allows researchers to establish how likely it is that observed differences between two means would have arisen by chance.

**With this objectives in mind, watch the following videos**

Dr. Kerschel Knapp provides a brief introduction to the t-test and gives examples of how it can be used to find statistical significance.

What is a *t*-test?

- A common statistical test that combines two groups of continuous variables. It can be used to determine if an experiment worked or not
- A common statistical test that compares two groups of continuous variables to detect statistically significant differences between the groups. It cannot be used to determine if an experiment worked or not.
- A common statistical test that compares two groups of continuous variables to detect statistically significant differences between the groups. It can be used to determine if an experiment worked or not.

Click for the correct answer.

Finish this sentence … ‘As effect size increases’

- … power decreases.
- … power increases.
- … power remains the same.

Click for the correct answer.