Sxx Variance - Formula

x̄ = (80 + 70 + 90 + 85 + 75) / 5 = 80

| 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 | Sxx Variance Formula

| Student | Score | Deviation from mean | | --- | --- | --- | | 1 | 80 | 0 | | 2 | 70 | -10 | | 3 | 90 | 10 | | 4 | 85 | 5 | | 5 | 75 | -5 | x̄ = (80 + 70 + 90 +

Next, calculate the deviations from the mean: Sxx Variance Formula

By dividing Sxx by (n-1), we get the sample variance:

s² = Sxx / (n-1)