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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...
The chi-square hypothesis test is defined as: H0: 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.