The cells contain the sample size necessary to obtain the column Confidence Interval to within the row error of the true standard deviation. For example, 84 subjects will be necessary to obtain a 80% confidence that the standard deviation obtained is within ±10% of the true value.

The sample size in column 1 increases exponentially from 2, and the cells show error of estimation as ± percent of true Standard Deviation for 80%, 85%, 90%, 95%, 99% and 99.5% Confidence Intervals. for example, with a sample size 0f 32, the 80% confidence Interval or Error is ±16.3% of the true value