Which description best defines repeatable measurements?

• A. A measurement is repeatable if the original experimenter can repeat the investigation with the same method and equipment and obtain the same results.
• B. Repeatable means different experimenters using different equipment obtain different results.
• C. Repeatable means results are always accurate.
• D. Repeatable means the measurement uses multiple methods.

Answer: (A)

Repeatability is about consistency when you repeat a measurement under the same conditions. If the same person uses the same method and the same equipment, the results should be the same (within the expected experimental uncertainty). This shows the procedure is reliable and not heavily affected by random errors. The idea that different experimenters with different equipment produce different results describes a lack of repeatability (and relates to reproducibility), not the concept itself. Repeatability doesn't guarantee accuracy—it's about producing the same results, not necessarily correct ones. Using multiple methods isn’t required for repeatability and can introduce more variation.