Sample Standard Deviation Units
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Sample Standard Deviation Units. The symbol of the standard deviation of a random variable is σ", the symbol for a sample is s. The standard deviation is a statistic that measures the dispersion of a dataset relative to its mean and is calculated as the square root of the variance.

Population and sample standard deviation · if the data is being considered a population on its own, we divide by the number of data points, n n nn.
The mean's standard error turns out to equal the population standard deviation divided by the square root of the sample size, and is estimated by using the . The units of the standard deviation are in the same units as the data being computed. That is, for instance, if the data are in feet, then the sample variance . The standard deviation is a statistic that measures the dispersion of a dataset relative to its mean and is calculated as the square root of the variance.
