I'm not perfectly sure about the stated phrase (or similar ones since I had to translate it). Does it mean

  • +-1 cm, or
  • +-0.5 cm?

I guess many people use it in the first way but only the latter will give a range for our value that is exactly 1 cm.


closed as primarily opinion-based by Jon Custer, David Hammen, ZeroTheHero, Kostya, John Rennie May 29 '17 at 7:21

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  • $\begingroup$ It is not a very exact terminology. I think the best if we say, the deviation is 1 cm. Note, many independent probability variable sums together always to a normal distribution. $\endgroup$ – user259412 May 28 '17 at 1:09
  • $\begingroup$ I would assume that it means your uncertainty is $0.x$ cm, which I think is closer to the first statement. $\endgroup$ – Kyle Kanos May 28 '17 at 11:16