Середнє квадратичне відхилення середнього арифметичного (Ukrainian Wikipedia)

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Gurland, J; Tripathi RC (1971). A simple approximation for unbiased estimation of the standard deviation. American Statistician. American Statistical Association. 25 (4): 30—32. doi:10.2307/2682923. JSTOR 2682923.
Barde, M. (2012). What to use to express the variability of data: Standard deviation or standard error of mean?. Perspect Clin Res. 3 (3): 113—116. doi:10.4103/2229-3485.100662.{{cite journal}}: Обслуговування CS1: Сторінки із непозначеним DOI з безкоштовним доступом (посилання)
Isserlis, L. (1918). On the value of a mean as calculated from a sample. Journal of the Royal Statistical Society. Blackwell Publishing. 81 (1): 75—81. doi:10.2307/2340569. JSTOR 2340569. (Equation 1)

Gurland, J; Tripathi RC (1971). A simple approximation for unbiased estimation of the standard deviation. American Statistician. American Statistical Association. 25 (4): 30—32. doi:10.2307/2682923. JSTOR 2682923.
Isserlis, L. (1918). On the value of a mean as calculated from a sample. Journal of the Royal Statistical Society. Blackwell Publishing. 81 (1): 75—81. doi:10.2307/2340569. JSTOR 2340569. (Equation 1)
Bondy, Warren; Zlot, William (1976). The Standard Error of the Mean and the Difference Between Means for Finite Populations. The American Statistician. Taylor & Francis. 30: 96—97. JSTOR 2683803. (Equation 2)