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Psychometric Theory

Please answer the question in its entirety. Please address ALL points of the question:There are sources of error that are known to cause problems in test construction. Test items and test constructs are consistently affected by sources of error. It is important to isolate error as a way to increase the validity of a test. Please identify and explain how error is viewed within Classical Testing Theory and also examine how error is viewed in terms of Generalizability Theory both at the item level and the construct level.