# Student's T-test

Learn the different variations of Student's t-tests, such as independent samples t-test and paired samples t-test.

## We'll cover the following

We use the Student’s t-test to compare the means of two normal populations. It is useful when we have a small sample (typically less than 30), and the population standard deviation is unknown.

The t-test takes the difference and variability of sample means into account and then makes inferences about the test issue. There are two types of Student’s t-tests: the independent samples t-test and the paired samples t-test.

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