How do you calculate expanded uncertainty measurement? - Answers

Expanded uncertainty is calculated by multiplying the standard uncertainty (the standard deviation of the measured value) by a coverage factor (k), which corresponds to the desired confidence level, typically 95% for k=2. First, you evaluate the standard uncertainty from all sources of uncertainty in the measurement process. Then, you apply the formula: Expanded Uncertainty = k × Standard Uncertainty. This provides a range around the measured value within which the true value is expected to lie with the specified confidence level.