Which source of error variance affects parallel- or alternate-form reliability estimates but does not affect test-retest estimates?
A) fatigue
B) learning
C) practice
D) item sampling

Question

Quizplus · Accepted Answer

Item sampling refers to the fact that different forms of a test may have different items, which can introduce variability in scores. This affects parallel- or alternate-form reliability estimates because if one form has easier/harder items or different content than the other, then the scores may not be equivalent measures of the same construct. Test-retest reliability, on the other hand, is not affected by item sampling because the same items are used across testing occasions. Fatigue, learning, and practice effects are all sources of error variance that can affect both parallel/alternate-form and test-retest reliability estimates.

Which Source of Error Variance Affects Parallel- or Alternate-Form Reliability