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Why would we expect an acceptable validity coefficient to be a value of roughly 0.3, whereas...

Why would we expect an acceptable validity coefficient to be a value of roughly 0.3, whereas a reliability coefficient would need to be at least 0.7?

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Answer #1

Reliability coefficient measures accuracy of a test by measuring same set of individuals twice. Thus, this reliability should be high as accuracy should be more. Thus, reliability coefficient would need to be at least 0.7

Validity coefficients measures usefulness of test i.e. if a test is conducted and conclusion is made how much is the impact in the real world. Thus, most of the tests have validity coefficients up to 0.3 when compared in real world as this is quite less likely to happen

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