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**Unformatted text preview: **( 1 2 2 N x N i i = = Variance: it is the mean of the squares of the deviations of each measurement from the mean of the population. 2 stands for the variance of the . ) ( 1 2 N x N i i = = Standard Deviation: A representative of the deviations from the mean. Descriptive Statistics 1 ) ( 1 2 2 = = N x x s N i i Estimation of variance from a sample by Bessels correction: N/(N-1). (Sample Variance) s 2 stands for the variance of the sample. 1 ) ( 1 2 = = N x x s N i i Sample Standard Deviation: Descriptive Statistics shows the variability of the data by simple calculation though it is not related to the parameters of theoretical distributions. /N 1 = N i i x x 2 Descriptive Statistics Coefficient of Variation is the ratio between the standard deviation and the mean for the same set of data, expressed as a percentage. x s/ or /...

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