1. By ____________________
Classical Test Theory By
____________________

2. What is CTT?

3. X = T + E

4. What is “true score”?

5. Assumptions of CTT

6. Item Analysis Using CTT p – value (difficulty index)

7. Example How to calculate the difficulty index

8. discrimination index

9. Example How to calculate discrimination index

10. How do you improve a test by conducting the item analysis in CTT?

11. “Group dependent” item analysis

12. What is reliability?

13. Procedures for estimating reliability
Test – retest reliability

14. Alternate forms reliability

15. Internal consistency (split-half, KR-20, coefficient alpha)

16. What is standard error of measurement (SEM)?

17. SEM is the same for all the examinees because

18. The formula for SEM is

19. Example
Reliability = .91
SD = 10
Then, SEM is ____________

20. Limitations of CTT

21. Conclusion