Chapter 5: Reliability of Psychological Tests

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Correlation between two pairs of scores obtained from equivalent halves of a single test

Degree of correlation among all the items on a scale

Alternative to the true score model that estimates sources of variation in test scores

Consistently inflate or deflate test scores

Consistency and dependability of test scores

Inherent uncertainty associated with any measurement

Mean of all possible split-half correlations, corrected by the Spearman-Brown formula

Person's standing on a theoretical variable independent of any particular measurement