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A sample consists of four observations 1, 3, 5, 7. Then its variance is: |
4 $\frac{20}{3}$ 5 3 |
5 |
$\bar{x}=\frac{1+3+5+7}{4}=4$ $\text{Variance}=\frac{(1-4)^2+(3-4)^2+(5-4)^2+(7-4)^2}{4}$ $=\frac{9+1+1+9}{4}=\frac{20}{4}=5$ $\text{Variance}=5$ |
