What is Reliability
The stability or consistency of test results is measured by reliability. It can also be viewed as the capability of a test or a set of research findings to be replicated. A trustworthy instrument that consistently measures the right temperature is a medical thermometer, for instance.
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If a measure is trustworthy, it will yield consistent results no matter how many times it is used. For instance, if you took the SATs more than once before enrolling in school, your results should have been quite consistent. This is what test-retest reliability entails.
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