Which term concerns the reliability of a measurement tool, i.e., its consistency across trials?

Which term concerns the reliability of a measurement tool, i.e., its consistency across trials?

• A. Reliability of measures
• B. Validity of measures
• C. Sensitivity
• D. Specificity

Answer: (A)

Reliability is about consistency. If a measurement tool yields similar results across repeated uses or across different raters, it’s showing reliability. This means the scores are dependable and not just random. Validity, on the other hand, asks whether the tool actually measures what it’s intended to measure, not whether it’s consistent. Sensitivity and specificity describe how well a test correctly identifies true positives and true negatives, which is about classification accuracy rather than consistency across trials. So the term that concerns the consistency of a measurement tool across trials is reliability of measures.

Reliability is about consistency. If a measurement tool yields similar results across repeated uses or across different raters, it’s showing reliability. This means the scores are dependable and not just random. Validity, on the other hand, asks whether the tool actually measures what it’s intended to measure, not whether it’s consistent. Sensitivity and specificity describe how well a test correctly identifies true positives and true negatives, which is about classification accuracy rather than consistency across trials. So the term that concerns the consistency of a measurement tool across trials is reliability of measures.