PSY333 - Finals

Tests, reliability and validity, remember the voicethread questions too!

content validity

is the content of the test valid for the kind of test it is?

concurrent validity

two tests are measured at the **same time**

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predictive validity

two measures are related in the future (GRE and success in graduate school)

convergent validity

e.g., if your test measures depression, it should relate to other measures with depression

discriminant validity

looking to find little or no relationship between your test and measures of construct that are not theoretically related to your test

test-retest reliability

giving the same test twice to the same group of people

alternate form reliability

similar to test-retest reliability, but with a different test/measure

Cronbach’s alpha

reliability associated with split-half reliability

internal consistency

how individual items relate to each other -- correlation coefficient for every possible split

percentile rank

percentage of people falling below an obtained score and ranges from 1 to 99

standard score

different kinds of scores that are derived by converting an individual’s raw score to a new score that has a new mean and new standard deviation

standard error of measurement

where we would expect a person’s score to fall if they took the instrument over and over again

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