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What is Reliability vs. Validity Explained about?

Reliability refers to the consistency of measurement and whether the same results can be produced from repeated attempts, while validity determines if a measurement accurately evaluates the concept it aims to measure. A test can be reliable without being valid if it consistently measures something different than what it aims to, whereas a valid test is always reliable. Reliability is easier to assess than validity, which determines the accuracy of what a measurement evaluates.

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