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# Uncertainties help!

Physics and electronics discussion, revision, exam and homework help.

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1. Uncertainties help!
For example, if a micrometer was measuring to the nearest 0.01mm would the uncertainty of one reading be 0.01mm or would it be 0.005mm which is half of the precision of the micrometer?

I have heard both answers but I'm not sure which one is right?

Thanks

EDIT also say if the percentage uncertainty of X was 3% then what would the percentage uncertainty of 5X be?
Last edited by Nodes Of Ranvier; 15-04-2012 at 19:25.
2. Re: Uncertainties help!
well depends what type of thing you are measuring with it.

in the simplest case where it's a completely simple and perfect 'block' i'd go for plus-minus 0.005

otherwise you could do repeats and look at standard deviation, standard error in the mean etc : )

it's not set in stone

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Last updated: April 15, 2012
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