Which statement accurately describes reliability and validity?

Which statement accurately describes reliability and validity?

• A. Reliability and validity are interchangeable terms.
• B. Reliability is about consistency; validity is about whether the measure captures the intended construct.
• C. A test cannot be reliable unless it is valid.
• D. Validity guarantees reliability.

Answer: (B)

Reliability is about consistency in measurements, while validity is about whether the measurement actually captures the intended construct. So a reliable test gives stable, repeatable results across occasions, items, or raters. But that stability doesn’t by itself prove that it’s measuring the right thing; it could consistently measure something else. Think of reliability as showing that the measurement is repeatable, and validity as showing that the measurement is relevant and accurate for the concept you’re trying to assess. A test can be reliable but not valid if it yields consistent scores that don’t reflect the intended construct. Conversely, a valid measure is typically expected to be reliable, but validity does not entail perfect reliability on its own. In short, the statement that reliability concerns consistency and validity concerns whether the measure targets the intended construct is the best description.

Reliability is about consistency in measurements, while validity is about whether the measurement actually captures the intended construct. So a reliable test gives stable, repeatable results across occasions, items, or raters. But that stability doesn’t by itself prove that it’s measuring the right thing; it could consistently measure something else.

Think of reliability as showing that the measurement is repeatable, and validity as showing that the measurement is relevant and accurate for the concept you’re trying to assess. A test can be reliable but not valid if it yields consistent scores that don’t reflect the intended construct. Conversely, a valid measure is typically expected to be reliable, but validity does not entail perfect reliability on its own.

In short, the statement that reliability concerns consistency and validity concerns whether the measure targets the intended construct is the best description.