The question of whether different items on a test correlate with one another is a question of

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The question of whether different items on a test correlate with one another is a question of internal reliability, which refers to the consistency of results within the test itself. Validity (A) refers to the accuracy of a test in measuring what it is intended to measure, while construct validity (B) refers to the degree to which a test measures the psychological construct it is designed to measure. Test-retest reliability (D) refers to the consistency of results from one administration of a test to another.

The Question of Whether Different Items on a Test Correlate