Paired Sample T-Test
- Assess the Normality of the two-time points in terms of variables.
- If both data are normal then:
- Analyze
- Compare means
- Paired Sample t-test
- Input the test variable (Pre in variable 1 and post in variable 2)
![](https://onestoppsychology.com/wp-content/uploads/2020/03/PSTT.png)
![](https://onestoppsychology.com/wp-content/uploads/2020/03/PSTT2.png)
Output:
- Look at the significance level.
- If the difference between pre-test and post-test are significant, then the test score is valid. i.e. t is valid at -4.123 (where post-test is higher indicated by the minus sign)
![](https://onestoppsychology.com/wp-content/uploads/2020/03/paired-output.png)