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It is used, along with significant digits, to indicate the precision of a measurement. Thus, in the two-significant-digit measurement 5.4 0.2 meters, the uncertainty interval is 0.2 meters. This means that the true value of the measurement is believed to lie between 5.2 meters and 5.6 meters.
In other words, any single value has an uncertainty equal to the standard deviation. Therefore, if another reading is taken of the same measurand, there is a 68% chance the measurement will fall within one standard deviation of the mean and a 95% chance that it will fall within two standard deviations of the mean.he results of the measurement would then be reported as 15.672 Â± 0.0011mm with a confidence level of 68% using a Gaussian pdf. The confidence level of the measurand falling within the uncertainty range can be increased to 95% by multiplying 0.00114 by 2 to arrive at 0.0023.