Question

What is the symbol for the sample standard deviation?

Answer 1

Symbol for the sample standard deviation.

Standard deviation is the measure of the dispersion of statistical data. Dispersion is the extent to which values in a distribution differ from the average of the distribution. The Standard deviation is usually represented as $\sigma$.

And symbol $\mathrm{S}$ or $\mathrm{SD}$ is used for the standard deviation of a sample, and $\sigma$(lower case sigma) for standard deviation of a population.

Hence, the standard deviation is usually represented as $\sigma$ or $\mathrm{S}$ or $\mathrm{SD}$.