CBT Psychometric Principles and Analysis 4

Question 1

A psychometrician calculates the standard error of measurement (SEM) for a test with SD = 15 and reliability = 0.91. Approximately what is the SEM?

Accepted Answer

4.50

Answer

SEM = SD × √(1 − reliability) = 15 × √(0.09) = 15 × 0.30 = 4.50.

Question 2

Which of the following is a key assumption of parallel test forms in classical test theory?

Accepted Answer

Both forms have equal true scores and equal error variances for all examinees

Answer

Parallel forms require equal true scores and equal error variances for every examinee, ensuring the forms are interchangeable measures of the same construct.

Question 3

In computerized adaptive testing (CAT), which method is most commonly used to select the next item after each response?

Accepted Answer

Select the item with maximum information at the current ability estimate

Answer

CAT algorithms typically select the item that provides maximum Fisher information at the current theta estimate, efficiently narrowing the measurement error.

Question 4

A test blueprint specifies that 30% of items must cover 'Application' and 20% must cover 'Analysis' per Bloom's Taxonomy. This document primarily supports which type of validity evidence?

Accepted Answer

Content validity

Answer

A test blueprint or table of specifications documents systematic domain coverage, providing content validity evidence that the test adequately samples the intended construct.

Question 5

When comparing two tests measuring the same construct, a correlation of r = 0.78 is found. This supports which type of validity evidence?

Accepted Answer

Convergent validity

Answer

Convergent validity evidence is demonstrated when a test correlates highly with other measures of the same or theoretically related constructs.

CBT - Computer Based Testing Practice Test

CBT - Computer Based Testing Practice Test

CBT Psychometric Principles and Analysis 4