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s(x) is the standard deviation of a sample of data. S is the standard deviation of the entire population of your sample. If youre looking for the standard deviation or volatility of stocks, hereâs a blog which includes a table with all of the equa...
If X is a random variable from a normal distribution with mean Î¼ and standard deviation Ï, its Z-score may be calculated from X by subtracting Î¼ and dividing by Ï. For the average of a sample from a population n in which the mean is Î¼ and the standard deviation is S, the standard error is S/ân: