Which statement correctly defines reliability in testing?

• A. It refers to the degree to which the test measures what it intends to measure.
• B. It describes how well the test items measure the content of the course.
• C. It is the consistency of test scores from one measurement to another.
• D. It is the process of validating a test with experts.

Answer: (C)

Reliability means the consistency of scores across repeated measurements. If a student were to take the same test again under similar conditions, a reliable test would yield similar results, indicating little random error in the measurement. This idea is captured by saying the scores are consistent from one measurement to another.

The other statements describe validity aspects: measuring what the test intends to measure, aligning items with course content, and the process of validating the test with experts are all about validity evidence rather than reliability. Remember, reliability is necessary for validity but not sufficient—it's possible for scores to be consistent yet not actually measure the intended construct (like a scale that consistently weighs the same amount but is off the true weight).