BESC1433 Lecture Notes - Lecture 11: Classical Test Theory, Observational Error, Sampling Error

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23 Dec 2018
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Test results need to be reproducible, consistent (reliable), and meaningful (valid). Reliability refers to the consistency of scores obtained by the same persons when re- examined with: the same test on different occasions: different sets of items measuring the same thing, different conditions of testing. Individual"s possess stable traits (e. g. , intelligence) that can be measured: random errors contribute to measurement scores, the actual score you get on a test will reflect your actual ability plus random error. Observed score = true score + error: random error is expected and accounted for. It"s the test-maker"s job to minimise the sources of random error in scores on their test. Sd (i. e. , sd of errors") = std error of measurement (sem) how much a score deviates from the real" score. 99% level, z = 2. 58: annie scored 100 on the wechsler adult intelligence scale. I might think your tat story is unusual but another rater might disagree.

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