n**Definitional**

n1. Find N, SX, and mean

n2. Subtract mean (X)
from each X for deviation score

n3. Square each
deviation score (XÐ X)2

n4. Sum the deviation
scores S(*X* Ð X )2 = SS (aka
Variation)

n5. Variance (s2) =
SS/N

n6. S (SD) =
SS/N

n**Computational
**

n1. N, SX, and mean

n2. Square each data
score

n3. Compute SS = S X2 - __(____S____X)____2
__

N

n4. Variance (s2) = SS/N

n5. S (SD) = SS/N