Sxx Variance Formula Jun 2026

| Student | Score | Deviation from mean | Squared deviation | | --- | --- | --- | --- | | 1 | 80 | 0 | 0 | | 2 | 70 | -10 | 100 | | 3 | 90 | 10 | 100 | | 4 | 85 | 5 | 25 | | 5 | 75 | -5 | 25 |

In statistics, represents the sum of the squared differences between each individual data point ( ) and the arithmetic mean ( ) of the dataset. Sxx Variance Formula

To find the slope ($b$) of the regression line, you need two sums: | Student | Score | Deviation from mean

Raw sum of squares ( \sum x_i^2 ) is not Sxx. Never use raw sum for variance or regression without subtracting the correction term. Sample variance ( s^2 = S_xx / (n-1) = 14

Sample variance ( s^2 = S_xx / (n-1) = 14.8 / 4 = 3.7 ) Sample standard deviation ( s = \sqrt3.7 \approx 1.9235 )