DRC DRC Psychometrics and Research

Question 1

What is 'Item Response Theory' (IRT) as used by DRC in test development?

Accepted Answer

A statistical framework that models the relationship between student ability and item responses

Answer

IRT is a psychometric framework that models the probability of a correct response as a function of both student ability and item characteristics such as difficulty and discrimination.

Question 2

What does 'test reliability' mean in the context of DRC's psychometric quality standards?

Accepted Answer

The consistency of test scores if the same students took equivalent versions of the test

Answer

Reliability refers to the consistency and stability of scores—a reliable test produces similar results for similar students under similar conditions, minimizing random measurement error.

Question 3

What is a 'standard error of measurement' (SEM) in DRC psychometrics?

Accepted Answer

An estimate of the variability in a student's score due to measurement error

Answer

The standard error of measurement quantifies how much a student's observed score is expected to vary from their true score due to imperfect measurement reliability.

Question 4

What is 'differential item functioning' (DIF) in DRC's psychometric analysis?

Accepted Answer

Statistical detection of items that perform differently for matched groups of students (e.g., by gender or ethnicity)

Answer

DIF analysis identifies items where students from different groups who have the same overall ability level show different probabilities of answering correctly, signaling potential bias.

Question 5

What is a 'test characteristic curve' (TCC) in DRC's IRT framework?

Accepted Answer

A graph showing the expected total score for the test as a function of student ability

Answer

The test characteristic curve plots the expected total test score against the underlying ability continuum, showing how well the test discriminates across the ability range.

DRC - Data Recognition Corp. Practice Test

DRC - Data Recognition Corp. Practice Test

DRC DRC Psychometrics and Research