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    Validity and reliability measurements in statistics

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    Validity is more critical to measurement than reliability. A valid measurement is reliable, but a reliable measurement may not be valid. Do you agree with these statements? Explain your answer. Provide examples to support your rationale.

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    Validity determines the magnitude (strength) of the correctness or actuality of our estimate or conclusion or inference. It answers the question, "is the measurement correct?" Consider, for a made up example of two scales that measure the weight of a new born baby. The measurements on scale 1 and 2 are 15lbs and 8lbs respectively. Based on past data, scale 2 is more valid than scale 1. There are different types of validity estimators.

    Reliability is a measure of consistency or repeatability under different conditions. A ...