Table :

A-3

Calculating the Squared Deviations from the Mean

X

X − μ

(X − μ)2

5

4

4

3

3

3

2

2

1

5 − 3 = 2

4 − 3 = 1

4 − 3 = 1

3 − 3 = 0

3 − 3 = 0

3 − 3 = 0

2 − 3 = −1

2 − 3 = −1

1 − 3 = −2

22 = 4

12 = 1

12 = 1

02 = 0

02 = 0

02 = 0

12 = 1

12 = 1

22 = 4

ΣX = 27

N = 9

μ = 3

Σ(X − μ) = 0

N = 9

Σ(X − μ)/N = 0

Σ(X − μ)2 = 12

N = 9

Σ(X − μ)2/N = 1.33