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Test Reliability—Basic Concepts

Test reliability Basic Concepts Samuel A. LivingstonJanuary 2018 Research Memorandum ETS RM 18-01 ETS Research Memorandum SeriesEIGNOR EXECUTIVE EDITORJ ames CarlsonPrincipal PsychometricianASSOCIATE EDITORSB eata Beigman KlebanovSenior Research ScientistHeather BuzickSenior Research ScientistBrent BridgemanDistinguished Presidential AppointeeKeelan EvaniniResearch DirectorMarna Golub-SmithPrincipal PsychometricianShelby HabermanDistinguished Research Scientist, EdusoftAnastassia LoukinaResearch ScientistJohn MazzeoDistinguished Presidential AppointeeDonald PowersPrincipal Research ScientistGautam PuhanPrincipal PsychometricianJohn SabatiniManaging Principal Research ScientistElizabeth StoneResearch ScientistRebecca ZwickDistinguished Presidential AppointeePRODUCTION EDITORSKim FryerManager, Editing ServicesAyleen GontzSenior EditorSince its 1947 founding, ETS has conducted and disseminated scientific research to support its products and services, and to advance the measurement and education fields.

with the following basic statistical concepts, at least to the extent of knowing and understanding the definitions given below. These definitions are all expressed in the context of educational testing, although the statistical concepts are more general. Score distribution: The number (or the percentage) of test takers at each score level.

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