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A good measuring instrument possesses three key qualities: validity, reliability, and usability. Validity refers to how well a test measures what it is intended to measure. There are four types of validity: content, concurrent, predictive, and construct validity. Reliability means a test is consistent and stable, which can be estimated using methods like test-retest, alternate forms, split-half, and Kuder-Richardson Formula 21. Usability refers to how practical a test is to administer, score, and interpret

Author

Nova Rhea Garcia

Language

EN