What is reliability and validity? Why are tests for reliability and validity necessary? What is the relation between reliability and validity?
What will be an ideal response?
Ans: Varies.
Reliability is the consistency of a measure. Assuming that the construct is not rapidly changing, reliability is expected for successful measurement of a given construct. We need to test for reliability in order to show that our measure provides consistent results; highly inconsistent results would suggest that we are not effectively measuring the construct, rather, the scores are being affected by error. Measurement validity is how well a measure is measuring what it is intended to measure. Without establishing measurement validity, we cannot assume that scores relate to our construct of interest. Reliability is a prerequisite for validity; a measure cannot be measuring what it intends to unless it also produces consistent results (assuming the construct is not rapidly changing). At the same time, a measure can be reliable without being valid. Effective measures are both reliable and valid.
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What will be an ideal response?