Psychometric Testing & Interpretation Flashcards

A vocational evaluator uses a norm-referenced test and finds a client scores at the 25th percentile. What does this mean?

Answer: The client scored higher than 25% of the normative sample

A percentile rank of 25 means the client scored equal to or higher than 25% of individuals in the normative comparison group.

Which type of reliability assesses consistency of a test across two different forms of the same instrument?

Answer: Alternate forms reliability

Alternate forms (parallel forms) reliability measures how consistently two different versions of the same test produce equivalent scores.

In psychometric testing, what does a standard error of measurement (SEM) represent?

Answer: The estimated variability in a person's scores due to measurement error

SEM estimates the amount of error in an individual's observed score, defining a confidence interval around the true score.

A test has high specificity but low sensitivity. In vocational assessment, this means the test is better at:

Answer: Correctly ruling out individuals without the trait

High specificity means the test correctly identifies true negatives—those who do not have the condition or trait being assessed.

Which scale of measurement allows calculation of meaningful ratios, such as 'twice as fast'?

Answer: Ratio

Ratio scales have a true zero point, making ratios between scores mathematically meaningful.

When interpreting the Wide Range Achievement Test (WRAT), a vocational evaluator should understand it primarily measures:

Answer: Basic academic skills including reading, spelling, and math computation

The WRAT assesses fundamental academic skills—word reading, sentence comprehension, spelling, and math computation—relevant to job training readiness.

A client's score profile shows a significant discrepancy between verbal and performance subtests. The evaluator's FIRST step should be to:

Answer: Investigate possible explanations such as language barriers, hearing loss, or learning disabilities

Score discrepancies are diagnostic indicators requiring investigation of neurological, sensory, linguistic, or disability-related factors before interpretation.