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Uncertainties
Shazkar Shadowstorm
Registered User regular
Registered User regular
Quick question regarding uncertainties for a lab or something...
Say I had something that was
d = [A*(B+U)]/(C+Z) where U and Z are uncertainties... do I do any rounding whatsoever until the very end? Because when I do that out, in the middle steps I end up with very high precision uncertainties... which seems somehow wrong and that I should shorten them there or something. Or do I not round anything at all till the end and keep all the precision.. and also, how should I round it to.
Say I had something that was
d = [A*(B+U)]/(C+Z) where U and Z are uncertainties... do I do any rounding whatsoever until the very end? Because when I do that out, in the middle steps I end up with very high precision uncertainties... which seems somehow wrong and that I should shorten them there or something. Or do I not round anything at all till the end and keep all the precision.. and also, how should I round it to.
poo
Shazkar Shadowstorm on
0
Posts
So your total error in d would equal U*(A/C) + Z(A*B/C^2) (remember you need absolute value for the second one, so you lose the negative sign from the differentiation)
And I think you would round only at the end to the same number of significant figures as whatever starting value had the least sig figs.