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S ummary . We consider the hypothesis that, in some circumstances, the variance of the marks awarded by an examiner will increase with the number of scripts he has marked. We test this hypothesis on the data of fifty‐four different class‐lists, and find a small but highly significant effect of the sort predicted. We consider various possible alternative explanations of the observed effect, and conclude that there is fairly strong evidence of the existence of such a bias.
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Farrell et al. (1960) studied this question.
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