Thus, as measurement error increases, our ability to discern a precise measure of the individual's true ability is decreased. As scores fluctuate across homogeneous and heterogeneous populations, the fluctuation of scores occurs at random and is not fully indicative of the individual's true ability. This is assumption is fundamental because it allows researchers to surmise that increases or decreases in observed scores are caused by measurement error that is completely independent of the individual's true score or ability. A fundamental assumption of reliability is that measurement error is dispersed randomly within a given population. Measurement error plays a central role in understanding reliability.
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