A rule of thumb for estimating the standard deviation of a population is to use 1/6 of the range of responses in a sample.

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This rule of thumb suggests that the standard deviation of a population can be approximated as one-sixth of the range of the data in a sample. This method provides a quick, rough estimate of the standard deviation, assuming the data follows a bell-shaped, normal distribution.

A Rule of Thumb for Estimating the Standard Deviation of a Population