Classical Test Theory and Music Testing - Oxford Handbooks - 2 views
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applications of classical test theory to K-12 music education assessment are considered
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During this period, measurement was viewed as a mechanism by which human traits could be identified and individuals compared
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By the beginning of the 20th century, the concept of (p. 462) measurement error was well recognized, and psychometricians focused their efforts on estimating and accounting for error.
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In CTT, an observed measure or score (X) consists of two constituent parts—the true score (T) and measurement error (E):
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According to CTT, measurement error arises because mental processes are idiosyncratic and in a state of change such that individuals are incapable of performing optimally on a single test or performance task.
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SEM represents the spread of observed scores for a single individual if that person were tested multiple times.