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To yield useable data, surveys, assessment tools, and other data collection instruments need to be both reliable and valid. Reliability is a measure of the degree to which such instruments consistently measure a characteristic or attribute. Statistically, reliability is a measure of the observed variability in obtained scores on an instrument. Variability can come both from true variance (such as differences in opinions, knowledge, or other characteristics of the individual) or from error... więcej
Salem Press Encyclopedia, 2021. 3p.
