\"A test has validity evidence if we can demonstrate that it measures what it says it measures,\" (Kubiszyn & Borich, 2010, p. 329).

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Reference:

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Kubiszyn, T. & Borich, G. (2010). Educational testing & measurement: Classroom application and practice (9th ed.). John Wiley & Sons, Inc., Hoboken, NJ.

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Validity & Reliability