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Evidence Guide: MSL925005 - 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!

From the Wiki University

 

MSL925005 - 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 repeated 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
  3. Assign degrees of freedom to each uncertainty component
Calculate the standard deviations and standard deviation of the mean from the repeated 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:

 

 

 

 

 

 

 

Assign degrees of freedom to each uncertainty component

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 and multiply each standard uncertainty by its sensitivity coefficient and ensure they are all expressed in the unit of the output
  2. Calculate a combined standard uncertainty
  3. Determine an appropriate coverage factor based on the estimated effective degrees of freedom
  4. Calculate the expanded uncertainty
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

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate a combined standard uncertainty

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine an appropriate coverage factor based on the estimated effective degrees of freedom

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate the expanded uncertainty

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Report the expanded uncertainty

  1. Report the measurement 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 measurement 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

Required Skills and Knowledge