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Validity and Accuracy

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Explain what the difference is between validity and accuracy? References are provided.

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Solution Summary

This solution explains the difference between validity and accuracy by defining both words and comparing them to each other in real-life situations.

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1. What is the difference between validity and accuracy?

Accuracy is "a criterion used in evaluating the quality of information. Accuracy measures the degree to which information sources are free from mistakes and errors. An encyclopedia which said that the Oakland Raiders won the Super Bowl in 2000 would be giving inaccurate information" (lib.nmsu.edu/instruction/healthsci/vocab.html). Accuracy is the nearness of a measurement to its true value or accepted value (www.brendan.com/glossary.html). It is the difference between the observed average value of the measurements and the true value (www.sixsigmalive.net/glossaryA.htm).

Conversely, validity is the "degree to which a statistical technique accurately measures or predicts a value-a valid sample will exhibit the characteristics of the population. For example, a valid sample drawn from a mailing list will respond to a promotion at a rate equal to the predicted response rate of the total mailing list" (http://www.answers.com/topic/validity?cat=technology). A measurement that is valid must also also be accurate; however, a measure that is accurate, it not ...

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