What is the difference between reliability and validity?
A) Reliability is the degree to which a test score correlates with some external criterion and validity is the degree to which a test score reflects an individual's true abilities.
B) Reliability is the extent that scores predict future scores and validity is the accuracy of these scores.
C) Reliability is how well scores correlate with future measures and validity is the extent that scores on one test correlate with scores on a similar test.
D) Reliability is the consistency in test scores over time and validity is the extent to which a test measures what it says it measures.

Question

Quizplus · Accepted Answer

Reliability refers to the consistency in test scores over time or across different scorers, while validity refers to the extent to which a test measures what it claims to measure. Therefore, option D is the best choice as it accurately defines both reliability and validity. Option A is incorrect because it conflates validity with criterion-related validity. Option B is incorrect because it refers to predictive validity, which is only one type of validity. Option C is incorrect because it refers to test-retest reliability, a specific type of reliability, and does not address validity.

What Is the Difference Between Reliability and Validity