Paired‑Samples T Test compares the means of two measurements taken from the same individual, object, or related units.

Paired‑Samples T Test has the following hypotheses:

*Null hypothesis*: The mean of the paired differences is equal to zero.

*Alternative hypothesis*: The mean of the paired differences is not equal to zero.

**Assumption**

1. Variable should be continuous.

2. Observations should be independent.

3. Dependent variable should be approximately normal.

4. Outliers should not be for the dependent variable.

A group of students were subjected to the test before attending a training program and then again after completing the training program. An attempt was made to find any difference in marks scored before and after attending the training program.