Information and certainty.

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Abstract
54 Ss were tested in an "expanded-judgment" situation to determine the increase of mean certainty in a hypothesis as a function of the amount of information provided. Under these conditions mean certainty increased as a linear function of the t ratio of the difference of the true and a hypothetical mean. Moreover, it was found that the formulation of a hypothesis is accompanied by a significant degree of certainty in its correctness prior to presentation of any information. A 2nd experiment supported the last finding but demonstrated that mean certainty can be accurately predicted on the basis of amount of information provided only if the ratio of the variability of the information to the mean difference remains constant. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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