Which statement best describes discriminant validity in test construction?

Which statement best describes discriminant validity in test construction?

• A. Discriminant validity occurs when a test correlates highly with measures of the same construct.
• B. Discriminant validity shows the test is not highly related to measures of different constructs, supporting distinctness.
• C. Discriminant validity guarantees high reliability.
• D. Discriminant validity is not necessary if convergent validity is strong.

Answer: (B)

Discriminant validity asks whether a test truly measures a construct that is distinct from other constructs. The best description is that the test is not highly related to measures of different constructs, which supports the idea that the test captures something unique rather than something else it could be mixing in. When a test correlates strongly with measures of the same construct, that reflects convergent validity, showing the test aligns with what it’s supposed to measure. Reliability is a separate quality about consistency, not about how it relates to other constructs. Even with strong convergent validity, discriminant validity remains important to confirm that the test isn’t overlapping with unrelated constructs, ensuring distinctiveness.

Discriminant validity asks whether a test truly measures a construct that is distinct from other constructs. The best description is that the test is not highly related to measures of different constructs, which supports the idea that the test captures something unique rather than something else it could be mixing in. When a test correlates strongly with measures of the same construct, that reflects convergent validity, showing the test aligns with what it’s supposed to measure. Reliability is a separate quality about consistency, not about how it relates to other constructs. Even with strong convergent validity, discriminant validity remains important to confirm that the test isn’t overlapping with unrelated constructs, ensuring distinctiveness.