The document shows the step-by-step process of calculating the sample standard deviation for a set of data containing the values 8, 7, 9, 11, 13, 12. First, the mean of the data is calculated. Then, the deviations from the mean are determined and squared. These squared deviations are summed and divided by n-1, where n is the number of data points, to obtain the sample standard deviation of 4.2.