A psychologist wants to determine the criterion-related validity of an intelligence test by determining how well it predicts a student's placement in a special class.If the psychologist used the intelligence test for both diagnosis and special class placement,that criterion would be said to be
A) irrelevant.
B) contaminated.
C) invalid.
D) negatively skewed.

Question

Quizplus · Accepted Answer

When the same test is used for both diagnosis and placement, the criterion becomes contaminated. This can lead to an overestimation of the test's validity because the test score is being used to both diagnose and place the student in a special class. Contamination can lead to inflated validity estimates and compromise the validity of the test.

A Psychologist Wants to Determine the Criterion-Related Validity of an Intelligence