aReading Technical Foundations 3

Question 1

Which measurement framework underpins the item calibration process for aReading?

Accepted Answer

Item Response Theory (IRT)

Answer

aReading items are calibrated using Item Response Theory (IRT), which models the relationship between a student's ability and the probability of a correct response.

Question 2

What does a high item discrimination parameter (a-parameter) indicate in IRT?

Accepted Answer

The item clearly separates high-ability from low-ability readers

Answer

A high a-parameter means the item strongly differentiates between students of differing reading ability, making it more informative for the CAT algorithm.

Question 3

Which IRT parameter reflects an item's difficulty level in the aReading item bank?

Accepted Answer

b-parameter

Answer

The b-parameter (difficulty) represents the ability level at which a student has a 50% probability of answering the item correctly.

Question 4

In a three-parameter IRT model, what does the c-parameter represent?

Accepted Answer

The pseudo-guessing probability for a low-ability student

Answer

The c-parameter (pseudo-guessing) estimates the probability that a very low-ability student answers correctly by chance, common in multiple-choice formats.

Question 5

What is the primary purpose of the aReading item bank's calibration studies?

Accepted Answer

To establish stable item parameters before the items are used operationally

Answer

Calibration studies collect response data from large samples to estimate reliable IRT parameters for each item prior to operational use.

(aReading) FastBridge Reading Assessment Practice Test

(aReading) FastBridge Reading Assessment Practice Test

aReading Technical Foundations 3