Practice question · True or false
A scale reading 73.0, 73.1, 72.9 and 73.0 for a certified 70 kg weight is reliable but not valid.
Hints
- What is it agreeing with?
- Itself, consistently, and with the truth, not at all.
Show the answer
True
Why
True. Reliability is agreement with itself and validity is agreement with the truth; this scale is highly consistent and consistently 3 kg wrong. Reliability is necessary for validity and nowhere near sufficient, and a systematic bias is invisible to any repeatability check.
Practise Reliability and Validity
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