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### 15 Cards in this Set

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 An item difficulty index of .80 indicates that ____% of examninees answered item CORRECTLY 80% what item difficulty index represents the MOST differentiation the item makes between examinees? .50 what is the optimal item difficulty level? .50 note: except for true/false questions... then it's .75 classical test theory obtained test score reflects combination of truth & error what theory is item difficulty, reliability, & validity based on? classical test theory item response theory item characteristics stay the same accross samples ie sample-invariant methods used to evaluate reliability test-retest alternate forms split-half (e.g. Spearman-Brown) coefficient alpha (e.g. Kuder-Richardson Formula 20) inter-rater what does a reliability coefficient of .80 mean? 80% of variability in test scores is due to differences in true scores. 20% due to measurement error which method of reliability is NOT appropriate for speed tests internal consistency i.e. split-half which method of reliability is considered to be the most thorough? alternate forms what is the lowest reliability coefficient to be considered acceptable? .80 what is a standard error of measurement for? to calculate a confidence level around an examinee's score confidence intervals 68% +/- 1 standard error 95% +/- 2 standard errors 99% +/- 3 standard errors when would you use criterion-related validity to predict scores on some other measure 2 methods used to test construct validity 2. convergent & divergent validity othersise known as, Multitrait-Multimethod Matrix 2. factor analysis