Lecture 4

Question 1

Advantages and disadvantages of Classical test theory

Answer 1

A: Easy to apply and intuitive
D: Focus on test not items. Test properties depend on population. Person properties depend on test

Question 2

Item discrimination

Answer 2

Indicates relevance of the item to the trait being measured on the test.
Generally want this to be a large positive number.

Question 3

Advantages and disadvantages of IRT

Answer 3

A: Population and test independent. Focus on items
D: Statistically complex and need large samples

Question 4

Calculating parameters in a test

Answer 4

Number of items on the test times the number of parameters