Which option best describes the relationship between validity and reliability as stated?

Which option best describes the relationship between validity and reliability as stated?

• A. They always occur together
• B. They never relate
• C. They do not necessarily exist together
• D. They are identical concepts

Answer: (C)

Reliability and validity are two separate properties of measurement. Reliability is about consistency—do you get similar results across repeated administrations or scorers? Validity is about accuracy—does the test actually measure what you intend to measure? A measure can be reliable but not valid, meaning it gives consistent results that don’t reflect the intended construct. A valid measure, by necessity, must be reliable, but reliability alone does not guarantee validity. So the best description is that they do not necessarily exist together. In practice, you want both, with reliability acting as a prerequisite for validity.

Reliability and validity are two separate properties of measurement. Reliability is about consistency—do you get similar results across repeated administrations or scorers? Validity is about accuracy—does the test actually measure what you intend to measure? A measure can be reliable but not valid, meaning it gives consistent results that don’t reflect the intended construct. A valid measure, by necessity, must be reliable, but reliability alone does not guarantee validity. So the best description is that they do not necessarily exist together. In practice, you want both, with reliability acting as a prerequisite for validity.