Dispersion
| Term | Overview |
|---|---|
| Range | This can either be presented by giving the minimum and maximum (ie, 100 to 150) or just the amount between (ie, 50). |
| Population Variance σ2 |
σ2 = (Σ(x-µ)2)/N |
| Population Standard Deviation (σ) | σ = √σ2 |
| Sample Variance | |
| Sample Standard Deviation | |
| Empirical Rule | |
| Interquartile Range | |
| Interquartile Division | |
| Mean absolute deviation | Mean absolute deviation from the mean measures dispersion but not often used. Mathematically better is the sample standard deviation, which is the square root of the sample variance. MAD = [ Σ | X - X | ] / n |