| Name |
Symbol |
Population
or Sample? |
Formula |
| Range |
R |
Both |
R =
largest # - Smallest # |
| Interquartile
Range |
none |
Both |
IQR = Q3
- Q1 |
| Mean
Absolute Deviation |
MAD |
Both |
MAD = [the
sum of |xi - x|
] / n
n being the number of values |
| Sample
Variance |
S2 |
Sample |
S2
= the [sum of (xi - x)2
] / n -1 |
| Sample
Standard Deviation |
+square root symbol S2 |
Sample |
+ sq. rt.
S2 =
sq rt [{sum of (xi - x)2}/
n-1] |
| Population
Variance |
sigma2 |
Population |
Sigma2
= the [sum of (xi - µ)2 ] / N |
| Population
Standard Deviation |
+ sq. rt symbol sigma2 |
Population |
+ sq. rt.
sigma2 = sq. rt. [{sum of (xi - µ)2}/
N] |
| Coefficient
of Variation |
CV |
Sample |
cv =
(Sample Standard Deviation / x)
* 100% |
| Population
Coefficient of Variation |
None |
Population |
popcv =
sigma/µ * 100% |
