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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