Unit of competency Outline

Date retreived
22/07/2026 8:14 PM AWST

Whilst all efforts are made to provide accurate and timely information from the relevant source/documentation, please be aware that the information supplied may not be the most current version. The accuracy of the detail has not been confirmed by the Department and therefore should not be relied upon without first confirming the contents.

Analyse measurements and estimate uncertainties

Analyse measurements and estimate uncertainties

Unit of competency
National Code
MSL925005
State Code
OEX99
TGA Status
Current
DTWD Status
Approved
Current Release Number
1.00
Current Release Date
20/12/2022
View on TGA
State Implementation and Classification
Approved Date
24/05/2023
Field of Education
010103 - Statistics
Original Release Date
24/05/2023
Nominal Hours
80
Description
This unit of competency describes the skills and knowledge to use statistical analysis to estimate and report measurement uncertainty in accordance with the ISO Guide to the Expression of Uncertainty in Measurement (or its replacement Standard). Personnel are required to review their estimates of measurement uncertainty to assist with making decisions on the fitness for purpose of the measurements.This unit of competency applies to laboratory personnel who work in calibration and testing facilities, process and interpret data, and are required to determine uncertainties using standard methods. The rigour required in estimating uncertainty will depend on the required accuracy of the particular calibration, test or measurement. No licensing or certification requirements exist at the time of publication. However, regulations and/or external accreditation requirements for laboratory operations exist, so local requirements should be checked. Relevant legislation, industry standards and codes of practice within Australia must also be applied.
Notes
Elements and Performance Criteria
1. Identify the measured quantity and the uncertainty components
  • 1.1 Specify an equation for the measurement
  • 1.2 List uncertainty components that are associated with each input in the equation
2. Determine the size of each uncertainty component
  • 2.1 Calculate the standard deviations and standard deviation of the mean from the repeated measurement results
  • 2.2 Use calibration reports, manufacturer’s specifications, quality control and validation data, and experimental data to collect other available information on the uncertainty components
  • 2.3 Assign degrees of freedom to each uncertainty component
3. Reduce each uncertainty component to a standard uncertainty
  • 3.1 Allocate an appropriate distribution for each uncertainty component
  • 3.2 Calculate the standard uncertainties
4. Calculate an expanded uncertainty to the required confidence level
  • 4.1 Calculate the sensitivity coefficient for each uncertainty component and multiply each standard uncertainty by its sensitivity coefficient and ensure they are all expressed in the unit of the output
  • 4.2 Calculate a combined standard uncertainty
  • 4.3 Determine an appropriate coverage factor based on the estimated effective degrees of freedom
  • 4.4 Calculate the expanded uncertainty
5. Report the expanded uncertainty
  • 5.1 Report the measurement result and uncertainty to an appropriate number of significant figures
  • 5.2 Report the confidence level and coverage factor
  • 5.3 Determine the appropriateness of the size of the expanded uncertainty relative to the tolerance or required accuracy of the test
  • 5.4 Determine the fitness for purpose of the expanded uncertainty relative to the use of the measurement result
No information
No information
Replaces
State Code National Code Title Type
OAC73 MSL925003 Determine measurements of uncertainty Unit of competency