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Classical Test Theory

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**1. **Classical Test Theory By
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**2. **What is CCT?

**3. **X = T + E

**4. **What is “true score”?

**5. **Assumptions of CTT

**6. **Item Analysis Using CTTp – value (difficulty index)

**7. **Example How to calculate the difficulty index

**8. **discrimination index

**9. **ExampleHow 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