Unformatted text preview: would say the measurements diﬀered by 2 σ . Another method is to describe the percent error between the values percent error = | a-A | ( a + A ) / 2 × 100% and also express the total uncertainty as a percentage for comparison percent uncertainty = δa + δA ( a + A ) / 2 × 100% These types of objective statements about the measurement and uncertainty are an important part of a report. Subjective statements such as “the measured value was 0.2% oﬀ form the expected value so the measurement was successful” are not useful and often lead to incorrect conclusions - without knowledge of the uncertainty it is impossible to tell if an error is signiﬁcant, even if it seems small. Scientiﬁc reports have no room for subjective interpretation of what is signiﬁcant and what is not. With the tools for error analysis presented here there is no reason for such subjective statements. 99...
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- Fall '08
- Physics, σ, 0.2%, Total uncertainty