Reliable vs. Valid?
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How can a research project be reliable but not valid?
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This solution explains the question: How can a research project be reliable but not valid? For further detail on the relationship between reliability and validity, an article is also provided.
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1. How can a research project be reliable but not valid?
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DEFINITIONS:
Reliability: The extent to which a measurement instrument yields consistent, stable, and uniform results over repeated observations or measurements under the same conditions each time. For example, a scale is unreliable if it weighs a child three times in three minutes and gets three different weights. (1)
Validity: is the strength of our conclusions, inferences or propositions. More formally, Cook and Campbell (1979) define it as the "best available approximation to the truth or ...
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