Discussion
Why are uncertainty contributions usually combined in quadrature?
Answer: D
Independent random contributions add as the square root of the sum of squares, which is the correct statistical treatment and reflects that they are unlikely all to be at their extremes at once. Correlated contributions must be added linearly instead, which is why the independence has to be justified rather than assumed. The result is indeed smaller, but that is a consequence rather than a reason, and unidentified contributions are not covered by any method of combination.
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