What does reliability of measures refer to?

What does reliability of measures refer to?

• A. The accuracy of measures to reflect true values
• B. The consistency of measurements across time and raters
• C. The speed of measurement
• D. The sample size needed for measurement

Answer: (B)

Reliability is about consistency. It asks whether measurements yield stable results when you repeat them under the same conditions and whether different people measuring the same thing agree. That includes ideas like test-retest reliability (stable scores over time), inter-rater reliability (agreement between raters), and internal consistency (how well items on a scale relate to each other). The key point is reproducibility, not accuracy. Accuracy to reflect true values is about validity, not reliability. Speed of measurement and required sample size pertain to efficiency or precision, not how consistently a measure performs.

Reliability is about consistency. It asks whether measurements yield stable results when you repeat them under the same conditions and whether different people measuring the same thing agree. That includes ideas like test-retest reliability (stable scores over time), inter-rater reliability (agreement between raters), and internal consistency (how well items on a scale relate to each other). The key point is reproducibility, not accuracy.

Accuracy to reflect true values is about validity, not reliability. Speed of measurement and required sample size pertain to efficiency or precision, not how consistently a measure performs.