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Presentation transcript:

By ____________________ Classical Test Theory By ____________________

What is CTT?

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 item analysis in CTT?

“Group dependent” item analysis

What is reliability?

Procedures for estimating reliability Test – retest reliability

Alternate forms reliability

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

What is standard error of measurement (SEM)?

SEM is the same for all the examinees because

The formula for SEM is

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

Limitations of CTT

Conclusion