Table 1: Statistical Moments of a Random Variable
| Moment | Expected Value | Estimator |
|---|---|---|
| Mean value |
|
|
| Standard deviation |
|
|
| Skewness |
|
|
| Excess kurtosis |
|
|
Statistical moments of a random variable: definition by expected values and statistical estimators for a given sample set.
Process capability indices considering the lower specification limit
LSL, upper specification limit USL, the
target value T as well as the sample mean 
and sample standard deviation 
.