Abstract
Summary. The effect of multiple marking on the intercorrelation of marks awarded to a biology essay question in a public examination was investigated by having six markers each mark 44 scripts as part of the marking procedure in the 1969 Matriculation Biology examination set by the Public Examinations Board of South Australia. Intercorrelation coefficients were computed for final marks based on one, two, three or four opinions. The greatest increase in mean intercorrelation coefficient resulted from an increase from one to two opinions; the additional increases when three or four markers were used were statistically significant, but of smaller magnitude.
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