A researcher measures blood pressure with a device that consistently reads 10 mmHg higher than the true value for every participant. Which statement best describes this measurement?
Correct answer: A. It is reliable but lacks accuracy
- A. It is reliable but lacks accuracy
- B. It is valid but lacks consistency
- C. It is both accurate and precise
- D. It is neither systematic nor consistent
Explanation
A consistent 10 mmHg error means the device produces repeatable results but does not measure the true blood pressure, so it is reliable but not accurate or valid. Random variation would be needed to describe inconsistency.
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