Abstract
When reporting expanded uncertainty, rounding the number of significant figures can affect the associated level of confidence. A simple numerical method is used to measure the level of confidence obtained after different rounding methods have been applied. This also offers some insight into the meaning of level of confidence. The findings are consistent with NIST recommendations that, for a level of confidence of 95 %, an expanded uncertainty should be rounded to two significant figures and the accompanying measured value reported in the same precision.
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