Free Psychometrics Theoretical Foundations Questions and Answers

Question 1

What is the main focus of Classical Test Theory (CTT)?

Accepted Answer

Observed scores, true scores, and error

Answer

Classical Test Theory (CTT) is a foundational psychometric theory that focuses on the relationship between an observed score, a true score, and measurement error. CTT posits that an observed score on a test is composed of a true score (the actual, unobservable ability or trait) and random error. Its main goal is to estimate the reliability of a test and the precision of its measurements.

Question 2

What is a latent trait in psychometrics?

Accepted Answer

An underlying psychological construct inferred from data

Answer

In psychometrics, a latent trait (or latent variable) refers to an unobservable psychological construct or characteristic that is inferred from observable responses or behaviors. Examples include intelligence, anxiety, or conscientiousness. These traits cannot be directly measured but are hypothesized to underlie and explain patterns in test scores or other empirical data.

Question 3

Which psychometric theory emphasizes the probability of a specific response to a test item based on individual traits?

Accepted Answer

Item Response Theory (IRT)

Answer

Item Response Theory (IRT) is a modern psychometric framework that models the relationship between an individual's latent trait level (e.g., ability) and the probability of them giving a certain response to a test item. Unlike Classical Test Theory, IRT focuses on individual item characteristics and how they interact with a test-taker's ability, providing more detailed insights into item functioning and test-taker performance.

Question 4

What is factor analysis used for in psychometrics?

Accepted Answer

Exploring the structure of psychological constructs

Answer

Factor analysis is a statistical technique widely used in psychometrics to identify underlying dimensions or factors that explain the correlations among a set of observed variables. It helps researchers understand the structure of complex psychological constructs, such as personality or intelligence, by reducing a large number of observed variables into a smaller set of latent factors. This process reveals how different items or behaviors group together.

Question 5

What is a key assumption of Item Response Theory (IRT)?

Accepted Answer

Test-taker responses depend on both item characteristics and individual traits.

Answer

A key assumption of Item Response Theory (IRT) is that the probability of a test-taker answering an item correctly is a function of both the test-taker's underlying ability or trait level and the characteristics of the item itself (e.g., its difficulty and discrimination). This allows IRT to model how different individuals interact with different items, providing a more nuanced understanding of measurement than CTT.

PC - Psychometrics Certification Practice Test

PC - Psychometrics Certification Practice Test

Free Psychometrics Theoretical Foundations Questions and Answers