Psychologists who study psychometrics (the science of psychological test and measurements) identify two categories of factors that affect the reliability of psychological tests. The first category is factors related to the construction of the tests, these are called systemic errors and are built into the test.
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Lethargy is the experience of feeling fatigue, which comes along with depression. It causes a significant decrease in energy that affects your performance in most tasks. Lethargy is both physical and mental when you are depressed. You feel tired or physically “run-down” all the time.
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Psychologists, counselors and therapists use psychological testing as a supplement to clinical interviews. Through testing, a lot of information is gathered in a relatively short period of time.
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