Teaching intuitive statistics II. Aiding the estimation of standard deviations

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Abstract
Part I of this study [2] indicated that human subjects sometimes used the range when making intuitive estimates of variances. An experiment was performed which investigated the systematic use of a simple range rule to help estimate standard deviations and also to see if the subjects were able to make better direct estimates of standard deviations than of variances. The subjects were found to produce better estimates of standard deviations by using this ‘range rule’ than by a direct estimation procedure, particularly when the sample variances were small. No differences were found in the subjects' performance in making direct estimates of standard deviations and variances.

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