A probability dispersion model for assessing the effect of variability of knowledge within a group on accuracy of a pooled group decision demonstrates that: (a) the more heterogeneous the group, the more accurate the pooling result for groups whose members possess a knowledge level greater than .50, (b) the variability of the group makes no difference in the pooling result for groups whose members possess a knowledge level of exactly .50, and (c) the more homogeneous the group, the more accurate the pooling result for groups whose members possess a knowledge level lower than .50.
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