Practice question · Multiple choice
A bathroom scale reading 3 kg heavy every time is perfectly reliable and not valid at all. Why can reliability not substitute for validity?
Hints
- Ask what the scale would say if you weighed yourself ten times.
- Consistency and correctness are different questions.
Show the answer
C. Because reliability is only consistency, not correctness
Why
Reliability is necessary and not sufficient. An unreliable measure cannot be valid, but a perfectly reliable one can be measuring the wrong thing forever.
Practise Reliability and Validity
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