Psychological Testing and Assessment: An Introduction To Tests and Measurement, 5/e

Ronald Jay Cohen
Mark Swerdlik

Reliability

Discussion Questions


1		Why is there a need for different methods of estimating reliability for norm-referenced and criterion-referenced tests?



2		Why does an observed score always represent the combination of the true score plus the error score?



3		Discuss how the standard error of measurement is related to test interpretation.



4		One of your classmates earns an IQ of 100 on a particular intelligence test. Another earns an IQ of 110 on a different test. How is the standard error of the difference score involved in determining whether there exists a difference between the two scores? What factors affect the magnitude of the standard error of the difference score?



5		Discuss why test-retest reliability, using long test-retest time intervals, is inappropriate for tests such as the Bayley. Discuss other types of tests (e.g., state anxiety, mood) for which test-retest might be inappropriate.

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