Question 1

In classical test theory, the concept of reliability is used to quantify measurement precision. In IRT, the analogous concept is called _________.

Accepted Answer

A)   measurement correspondence
B)   discrimination
C)   information
D)   theta overlap C

Question 2

Describe the concept of item parameter invariance.

Accepted Answer

Parameter invariance means that the population that you use to estimate your item parameters does not depend on the underlying population from which those parameters are estimated. This property makes IRT very useful when comparing across different groups. It should be noted, however, that invariance only holds if the underlying assumptions of your IRT model are met (e.g., unidimensionality, local independence).

Question 3

In item response theory models, the underlying latent trait is commonly referred to as ___________.

Accepted Answer

A)   Theta
B)   Constructs
C)   Delta
D)   Omega A

Question 4

What are some key differences between classical test theory and item response theory.

Accepted Answer

The answer of What are some key differences between classical...

Question 5

Which of the following is not one of three parameters in the 3PL?

Accepted Answer

A)   discrimination
B)   difficulty
C)   guessing
D)   reflection

Question 6

How can you decide what is the best IRT model for a particular data set?

Accepted Answer

The answer of How can you decide what is the...

Question 7

What is a minimum suggested sample size required to do most IRT analyses as suggested by Shultz, Whitney, and Zickar (2021)?

Accepted Answer

A)   100
B)   250
C)   750
D)   3000

Question 8

The relationship between the underlying latent trait and the probability of answering an item correctly is called an _____________.

Accepted Answer

A)   Item Trace Function
B)   Item Functioning Statistic
C)   Item Response Function
D)   Item Relation Graph

Question 9

In confirmatory factor analysis, what is the preferred term by Shultz, Whitney, and Zickar (2021) for the item variance not explained by latent factors?

Accepted Answer

A)   error
B)   residual
C)   marker
D)   leftover

Question 10

Which of the following parameters is part of the 3PL model but not the 2PL model?

Accepted Answer

A)   guessing
B)   difficulty
C)   discrimination
D)   randomization

Question 11

After a model has been estimated on your particular data set, which of the following would you examine to see how to specifically improve model-data fit?

Accepted Answer

A)   Adjusted goodness-of-fit index
B)   Individual error terms
C)   Akaike Information
D)   Model modification indexes

Question 12

What are assumptions and requirements that need to be met to use IRT?

Accepted Answer

The answer of What are assumptions and requirements that need...

Question 13

One strength of item response theory compared to classical test theory is that IRT statistics estimated from one population can be compared to statistics collected from a different population. This property is called _________.

Accepted Answer

A)   parameter invariance
B)   population equivalence
C)   sample independence
D)   equatible comparison

Question 14

The idea that items should be uncorrelated with each other after controlling for the latent trait of the model is called ________.

Accepted Answer

A)   Factoral independence
B)   Factoral dependence
C)   Common interdependence
D)   Local independence

Question 15

Which is better? Classical test theory or IRT?

Accepted Answer

The answer of Which is better? Classical test theory or...

Exam 20: Item Response Theory