Sxx Variance Formula | DIRECT 2026 |

In many statistics textbooks, you might see the "computational formula," which is often easier to type into a calculator:

Sxx=∑(xi−x̄)2cap S sub x x end-sub equals sum of open paren x sub i minus x bar close paren squared : Individual data points. : The mean (average) of the data set. Sxx Variance Formula

Check: ( 250 = (5-1) \times 62.5 ). Works perfectly. In many statistics textbooks, you might see the

| Student | Score | | --- | --- | | 1 | 80 | | 2 | 70 | | 3 | 90 | | 4 | 85 | | 5 | 75 | Works perfectly

Suppose you have 5 exam scores: 70, 75, 80, 85, 90.

Sxx=∑x2−(∑x)2ncap S sub x x end-sub equals sum of x squared minus the fraction with numerator open paren sum of x close paren squared and denominator n end-fraction ∑x2sum of x squared : Square each number first, then add them up. : Add all numbers first, then square the total. : The total number of data points. Step-by-Step Calculation Example Sxxcap S sub x x end-sub for the dataset: Find the Sum of ∑xsum of x ): Find the Sum of x2x squared ∑x2sum of x squared ): Plug into the Computational Formula:

✅ Key point: