Uncertainty in Measurement

Which measurements are subject to uncertainty?

Measurements of length

Measurements of volume

All measurements

Measurements of weight

What is the difference between accuracy and uncertainty?

There is no difference

Accuracy is qualitative, uncertainty is quantitative

Accuracy is quantitative, uncertainty is qualitative

The level of precision

What is not a measurement uncertainty?

Operator error

Poor equipment readability

Temperature

Unstable behaviour of the product being measured

What does k stand for?

Correlation factor

Configuration factor

Coverage factor

Composite factor

What is measurement error?

The difference between the measured value and the true value

The difference between the highest and the lowest of a set of values

The quantification of the doubt around the measurement result

A qualitative inaccuracy in measurement

What is not a common way of reducing uncertainty in measurement?

Calibrate measuring instruments

Check measurements regularly

Use calculations that are traceable to national standards

Install cheap equipment

What is the coverage factor used for a level of confidence of approximately 95%?

Which of the following is not mentioned when expressing measurement uncertainty?

The measurement result

Coverage factor

How the uncertainty was estimated

Who estimated the uncertainty

Which standard specifies requirements for reporting and evaluating uncertainty of measurement?

ISO 17025

ISO 10012

ISO 9001

ISO 5725

An uncertainty calculation is a dynamic process and requires to be regularly reviewed to ensure that the contractual uncertainty limit is maintained.

True

False

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