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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...
Chi-Square Test for the Variance. where N is the sample size and s is the sample standard deviation. The key element of this formula is the ratio s/Ï0 which compares the ratio of the sample standard deviation to the target standard deviation. The more this ratio deviates from 1, the more likely we are to reject the null hypothesis.