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.