Why validity is harder to establish and evaluate

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Describe why validity is harder to establish and evaluate than reliability. To be honest I find this question difficult to answer because in psychology I find that they are both difficult, so I don't really see either one being harder than the other. My book provides poor information and I have been reading it over and over.

Reference no: EM1311086

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Why validity is harder to establish and evaluate : Explain why validity is harder to establish and evaluate than reliability.

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