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Evidence Guide: MSL925002 - Analyse measurements and estimate uncertainties

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

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MSL925002 - Analyse measurements and estimate uncertainties

What evidence can you provide to prove your understanding of each of the following citeria?

Identify the measured quantity and the uncertainty components

  1. Specify an equation for the measurement
  2. List uncertainty components that are associated with each input in the equation
Specify an equation for the measurement

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

List uncertainty components that are associated with each input in the equation

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine the size of each uncertainty component

  1. Calculate the standard deviations and standard deviation of the mean from the measurement results
  2. Use calibration reports, manufacturer's specifications, quality control and validation data, and experimental data to collect other available information on the uncertainty components
Calculate the standard deviations and standard deviation of the mean from the measurement results

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Use calibration reports, manufacturer's specifications, quality control and validation data, and experimental data to collect other available information on the uncertainty components

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Reduce each uncertainty component to a standard uncertainty

  1. Allocate an appropriate distribution for each uncertainty component
  2. Calculate the standard uncertainties
Allocate an appropriate distribution for each uncertainty component

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate the standard uncertainties

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate an expanded uncertainty to the required confidence level

  1. Calculate the sensitivity coefficient for each uncertainty component
  2. Calculate a combined standard uncertainty
  3. Determine an appropriate coverage factor based on the degrees of freedom associated with each uncertainty component
  4. Calculate the expanded uncertainty
Calculate the sensitivity coefficient for each uncertainty component

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate a combined standard uncertainty

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine an appropriate coverage factor based on the degrees of freedom associated with each uncertainty component

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate the expanded uncertainty

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Report the expanded uncertainty

  1. Report the result and uncertainty to an appropriate number of significant figures
  2. Report the confidence level and coverage factor
  3. Determine the appropriateness of the size of the expanded uncertainty relative to the tolerance or required accuracy of the test
  4. Determine the fitness for purpose of the expanded uncertainty relative to the use of the measurement result
Report the result and uncertainty to an appropriate number of significant figures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Report the confidence level and coverage factor

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine the appropriateness of the size of the expanded uncertainty relative to the tolerance or required accuracy of the test

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine the fitness for purpose of the expanded uncertainty relative to the use of the measurement result

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Evidence Guide

Elements describe the essential outcomes.

Performance criteria describe the performance needed to demonstrate achievement of the element.

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 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

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

4.2

Calculate a combined standard uncertainty

4.3

Determine an appropriate coverage factor based on the degrees of freedom associated with each uncertainty component

4.4

Calculate the expanded uncertainty

5

Report the expanded uncertainty

5.1

Report the 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

Required Skills and Knowledge

Elements describe the essential outcomes.

Performance criteria describe the performance needed to demonstrate achievement of the element.

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 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

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

4.2

Calculate a combined standard uncertainty

4.3

Determine an appropriate coverage factor based on the degrees of freedom associated with each uncertainty component

4.4

Calculate the expanded uncertainty

5

Report the expanded uncertainty

5.1

Report the 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

Evidence of competence in this unit must satisfy all of the requirements of the elements and performance criteria, and include demonstration of:

using scientific notation, correct units and correct number of significant figures

evaluating formulae containing powers, exponents and logarithms functions

preparing and interpreting linear graphs

using statistical analysis to estimate and report measurement uncertainty in accordance with the ISOGuide to the Expression of Uncertainty in Measurement

preparing a fully documented, realistic uncertainty budget that is appropriate for the application

calculating a combined standard uncertainty using root-sum-of-squares, accounting for correlations where necessary

gathering information about uncertainty components from calibration reports or reference material report

calculating sensitivity coefficients either experimentally or by partial differentiation

calculating expanded uncertainty

using spreadsheets to calculate uncertainties

deciding if the uncertainty is suitable for the accuracy required for the test and establishing whether it is fit for purpose using the tolerance to uncertainty ratio (TUR)

using and interpreting mean, standard deviation, standard deviation of the mean, degrees of freedom, histograms and frequency plots, probability, normal probability plots and control charts

using the student's t-table to get a coverage factor for a particular level of confidence

using and interpreting significance tests, such as t-test, f-test and analysis of variance (ANOVA), variances, standard deviation of prediction and linear regression

using regression methods for calibration, linearity checks and comparing analytical methods

using and interpreting normal, rectangular, triangular distributions and the factors used to reduce each to a standard uncertainty

allocating degrees of freedom to each uncertainty component using the Welch-Satterthwaite equation

reporting results and uncertainties in the required formats.

Must provide evidence that demonstrates knowledge of:

the steps in the measurement, test or calibration involved

the difference between errors, corrections and uncertainties

uncertainty in the uncertainty estimation process

uncertainty components that are common to the use of an instrument

uncertainty components that arise due to the instrument being used under different conditions to those when it was calibrated

uncertainty components, such as:

calibration uncertainty

instability or drift in the calibrated instrument

repeatability of the results

resolution or readability of the instrument

environmental influences, such as temperature, air pressure, humidity, vibration, electrical noise and gravity

reference material uncertainty

factors arising from using an instrument under a different operating environment or procedures (e.g. orientation of a transducer and immersion depth of a temperature probe)

reproducibility of quality control data

procedures for determining the uncertainty components associated with each of the inputs and whether they are significant and for applying appropriate corrections

manufacturer's specifications (e.g. instrument drift specification and reference materials)

procedures for determining uncertainty components from quality control data

the concept of degrees of freedom

the characteristics of a valid measurement

reporting requirements, such as the uncertainty in measurement (GUM), National Association of Testing Authorities (NATA) or other applicable reference material

confidence levels required by the National Measurement Act 1960 (e.g. 95% for most applications, but others may require a higher confidence level).

Range Statement

This field allows for different work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included.

Standards, codes, procedures and/or workplace requirements

Standards, codes, procedures and/or enterprise requirements include the latest version of one or more of:

Australian and international standards and guides, such as:

competency requirements for testing and calibration laboratories, quality management and measurement management

ISO 5725 Accuracy (trueness and precision) of measurement methods and results

ISO/IEC Guide 98-3:2008 Uncertainty of Measurement - Part 3 Guide to the Expression of Uncertainty in Measurement

Eurachem/CITAC Guide CG4 Quantifying uncertainty in analytical measurement, Eurolab technical report and Nordtest

National Association of Testing Authorities (NATA) accreditation program requirements and NATA technical notes

national measurement regulations and guidelines

Australian codes, such as of good manufacturing practice for medicinal products (GMP), and principles of good laboratory practice (GLP)

workplace documents, such as quality manual, customer quality plan, equipment manuals and warranty, supplier catalogues and handbooks

validated sampling and test procedures

Data

Data includes:

worksheets, spreadsheets or databases linked to information management systems

the results of tests, measurements and analyses

Records

Records include information associated with one or more of:

purchase of equipment and materials and service records

manufacturer datasheets

calibration reports

history of calibration and test results

Work health and safety (OHS) and environmental management requirements

WHS and environmental management requirements include:

· complying with WHS and environmental management requirements at all times, which may be imposed through state/territory or federal legislation. These requirements must not be compromised at any time

· applying standard precautions relating to the potentially hazardous nature of samples

accessing and applying current industry understanding of infection control issued by the National Health and Medical Research Council (NHMRC) and State and Territory Departments of Health, where relevant