For a measure to be considered valid, what concept must be present?

For a measure to be considered valid, what concept must be present?

• A. Reliability
• B. Test-retest reliability
• C. Intra-observer reliability
• D. Construct validity

Answer: (A)

Reliability is essential. It means the measurement yields consistent results across repeated uses, occasions, or raters. Validity asks whether the measure actually captures the intended construct, and you can't trust validity if the results aren’t reliable— inconsistency undermines what you’re trying to measure. So reliability must be present for a measure to be considered valid. It’s worth noting that a measure can be reliable but not valid if it consistently measures something else; reliability alone doesn’t guarantee validity, but validity cannot exist without reliability. Forms like test-retest reliability and intra-observer reliability are examples of reliability, while construct validity is a specific type of validity.

Reliability is essential. It means the measurement yields consistent results across repeated uses, occasions, or raters. Validity asks whether the measure actually captures the intended construct, and you can't trust validity if the results aren’t reliable— inconsistency undermines what you’re trying to measure. So reliability must be present for a measure to be considered valid. It’s worth noting that a measure can be reliable but not valid if it consistently measures something else; reliability alone doesn’t guarantee validity, but validity cannot exist without reliability. Forms like test-retest reliability and intra-observer reliability are examples of reliability, while construct validity is a specific type of validity.