And in the case of a series of data, for example, uses the symbols s, or instead, s.d. standard deviation of the sample, which is calculated from the following formula:
And in the case of a data set of sample data. Will use the symbol s or sd represent the standard deviation of the sample. This is calculated by the following formula.
And, in the case of the data set that is the data, for example, will use the symbol s or S.D. Instead of standard deviation of the sample. The calculated from the following formula