Which statement best describes content validity?

Which statement best describes content validity?

• A. It measures stability of scores over time.
• B. It correlates with a separate criterion external to the test.
• C. It ensures the assessment covers the entire defined domain.
• D. It assesses agreement among different raters.

Answer: (C)

Content validity asks whether the test items collectively represent the full range of content the test is intended to measure. If an assessment truly covers all areas of the defined domain and items are aligned with the objectives, it captures what it's supposed to assess. That is why the statement that the assessment covers the entire defined domain is the best description of content validity. Think of it this way: you want a math test to reflect all topics in the syllabus you claim to cover. If important topics are missing or some topics are overrepresented, the test isn’t truly representative of the domain, regardless of how well other psychometric properties are behaving. Stability of scores over time relates to reliability (test-retest), not content validity. Correlation with an external criterion speaks to criterion-related validity, not domain coverage. Agreement among different raters concerns interrater reliability, again separate from how well the content spans the intended domain.

Content validity asks whether the test items collectively represent the full range of content the test is intended to measure. If an assessment truly covers all areas of the defined domain and items are aligned with the objectives, it captures what it's supposed to assess. That is why the statement that the assessment covers the entire defined domain is the best description of content validity.

Think of it this way: you want a math test to reflect all topics in the syllabus you claim to cover. If important topics are missing or some topics are overrepresented, the test isn’t truly representative of the domain, regardless of how well other psychometric properties are behaving.

Stability of scores over time relates to reliability (test-retest), not content validity. Correlation with an external criterion speaks to criterion-related validity, not domain coverage. Agreement among different raters concerns interrater reliability, again separate from how well the content spans the intended domain.