What generalization was developed regarding the reliability of total scores on single-area achievement tests? The total scores usually have ___.

Question

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Total scores on single-area achievement tests usually have high reliability because they aggregate performance across a range of items within the same subject area, which tends to average out the effects of any individual item's peculiarities or the test-taker's momentary lapses, leading to a more stable and consistent measure of achievement in that area.

What Generalization Was Developed Regarding the Reliability of Total Scores