Certified Reference Material - Reference material, accompanied by documentation issued by an
authoritative body and providing one or more specified property values with associated uncertainties and
traceabilities, using valid procedures (JCGM200:2008).
Degrees of Freedom - The number of independent determinations (estimates) of a given statistical
magnitude (e.g. mean or standard deviation) that can be performed on the basis of a given data set.
Facility - It is recognised that not all testing or calibration activities are performed in a ‘laboratory’.
Accordingly, the expressions ‘facility’ and ‘laboratory’ are used interchangeably throughout this document.
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