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Validity and reliability, with examples

How important is validity and reliability in data collections? Please provide a couple of examples that are considered valid and reliable sources of data.

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The difference between validity and reliability depends upon what you are referring to. Validity refers to the degree to which the *results* of a study can be replicated with similar participants, in similar settings at similar times. This is internal validity. The degree to which the results can be duplicated with different populations, in different locations at different times is called ...

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Discussion of validity and reliability, with examples of each