A clinical psychologist is trying to develop a personality test to measure depression. She gives the test to a group of depressed individuals today and then plans to give them the same test four weeks from today. She is doing this to establish the test's:

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The psychologist is administering the test twice to the same group to see if it produces consistent results over time, which is a measure of test-retest reliability.

A Clinical Psychologist Is Trying to Develop a Personality Test