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Sxx Variance Formula [new] <8K – 2K>

It measures the total corrected sum of squares for the predictor variable (x). If (x_i) are fixed constants (standard regression assumption), (S_xx) is not a random variable — it has no variance; it’s just a constant.

Under the :

[ \mathrmVar(S_xx) = 2(n-1)\sigma_x^4 ] We know: sxx variance formula

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