Sxx Variance Formula Work Jun 2026

is very small, our data points are bunched together, making our prediction of the slope very unstable. If cap S sub x x end-sub

While ( S_xx = \sum (x_i - \barx)^2 ) is the definition, it is not always the easiest to compute by hand, especially for large ( n ). Two alternative formulas are computationally more efficient and less prone to rounding error. Sxx Variance Formula