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second step, calculation of each standard uncertainty and degrees of freedom
In this study, all the standard uncertainty values are evaluated by Type B evaluation.
For the Type B evaluation, past measurement data, prior quality control experimental results and certificates of various references are essentially needed.
Since the sampling area is determined through the diameter of the sampling hole, the standard uncertainty of the sampling area is calculated as follows.
Also, the degrees of freedom for Type B evaluation are determined as following the equation below, and following factors are mostly similar to this.
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