|
2.
Measurement Process Characterization
2.5. Uncertainty analysis
|
|||
| Definition of standard uncertainty | The sensitivity coefficients and standard deviations are combined by root-sum-of-squares to obtain a 'standard uncertainty'. Given R components, the standard uncertainty is:
 | ||
|
Expanded uncertainty assures a high level of confidence | If the purpose of the uncertainty statement is to provide coverage with a high level of confidence, an expanded uncertainty is computed as
where k is chosen to be the | ||
| Interpretation of uncertainty statement | The expanded uncertainty defined above is assumed to provide a
high level of coverage for the unknown true value of the measurement of interest so
that for any measurement result, Y,
 | ||
critical value
from the