Psychometric Testing & Interpretation Flashcards

Which statistical measure is MOST appropriate for describing the central tendency of a nominal-level variable such as occupational category?

Answer: Mode

The mode—the most frequently occurring value—is the only meaningful measure of central tendency for nominal (categorical) data.

A vocational evaluator finds a correlation of r = 0.75 between scores on an aptitude test and on-the-job performance ratings. The coefficient of determination (r²) indicates that the aptitude test accounts for approximately what percentage of variance in job performance?

Answer: 56%

r² = 0.75² = 0.5625, meaning the aptitude test accounts for approximately 56% of the variance in job performance.

When a test is described as 'power' rather than 'speeded,' it means:

Answer: All examinees have adequate time; difficulty of items, not speed, determines performance

A power test measures ability through item difficulty with generous time limits, distinguishing it from speeded tests where pace determines performance.

The Bennett Mechanical Comprehension Test (BMCT) is MOST appropriate for evaluating a client's suitability for:

Answer: Mechanical, technical, and engineering-related occupations

The BMCT measures understanding of mechanical principles and physical relationships, making it relevant for selecting or evaluating individuals for mechanical and technical jobs.

In psychometric theory, the classical test theory formula T = X − E means:

Answer: Observed score equals true score plus error

Classical test theory states that an observed score (X) is the sum of the true score (T) and random measurement error (E), so X = T + E.

A client earns a grade equivalent score of 8.5 on a reading test. This MOST accurately means:

Answer: The client's raw score equals the average raw score of students in the fifth month of eighth grade

Grade equivalents indicate that the client's raw score equals the median raw score obtained by a norm group at that grade and month, not that they perform like an eighth grader in all respects.

Which of the following BEST exemplifies the use of an ecological assessment approach in vocational evaluation?

Answer: Observing the client performing tasks in their actual or simulated work environment

Ecological assessment evaluates the person within their natural or representative environment, capturing real-world performance that standardized tests may not reflect.