population standard deviation
Square root of the population variance where the greek letter mu, is used to represent the mean of the population, and N is the number of observations in the overall population. The population variance is expressed in units of squared deviations, or squared values of individual observations, rather than in the same units as the individual observations. In the case of net profit and sales revenue, variance is expressed in terms of dollars squared. In the case of net profit margin, variance is expressed in terms of squared percentages. The population standard deviation, or square root of the population variance, is a measure that describes dispersion throughout the entire population in the same units as is characteristic of the underlying data (e.g., dollars or percentages). The standard deviation for a measure that describes the overall population is given by
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