Classical Test Theory

Classical Test Theory PowerPoint PPT Presentation


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What is CCT?. . X = T E. . What is true score"?. . Assumptions of CTT. . Item Analysis Using CTT p value (difficulty index). . Example How to calculate the difficulty index. . discrimination index. . Example How to calculate discrimination index. . How do you improve a test by conducting the

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Classical Test Theory

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1. Classical Test Theory By ____________________

2. What is CCT?

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

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