How to get standard deviation from sxx?

Standard deviation is a statistical measure that can be calculated using two different formulae.

The first formula for standard deviation is s = ∑ (X − X ¯)² / (n − 1), where n represents the sample size. This formula involves subtracting the mean (X ¯) from each data point (X), squaring the result, summing these squared differences, and then dividing by the sample size minus one.

The second formula for standard deviation is a rearranged version of the first, which may be more convenient for calculation purposes. It is given by s = √[∑X² − (∑X)² / n] / (n − 1). This formula involves squaring each data point, summing these squares, subtracting the square of the sum of the data points divided by the sample size, and then dividing by the sample size minus one, before taking the square root of the result.

Both formulae provide the same result when used to calculate the standard deviation of a sample.

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