- #1
_Greg_
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Hi
just got a couple of question about errors in measurements.
I have a table of results of different meter stick measurements which are accurate to 0.1 cm.
Now a meter stick reads to 0.1 cm and the uncertainty is usually 20% of the smallest reading.
so all of my readings should be +/- 0.02 cm
(1) Now I am wondering, say i have 3 results, do i have to add all 3 uncertainties to give a total uncertainty of 0.06?
or do you not add the uncertainties since they are all the same, therefor a total uncertainty of 0.02?
Iv also made a graph with these values and calculated the uncertainty in that using:
G/deltaG = 2 x delta Y / y2 - y1
(2) so i have an uncertainty in the graph and i assume i have to add that to my uncertainty of measurements to get the total uncertainty?
thanks for reading
just got a couple of question about errors in measurements.
I have a table of results of different meter stick measurements which are accurate to 0.1 cm.
Now a meter stick reads to 0.1 cm and the uncertainty is usually 20% of the smallest reading.
so all of my readings should be +/- 0.02 cm
(1) Now I am wondering, say i have 3 results, do i have to add all 3 uncertainties to give a total uncertainty of 0.06?
or do you not add the uncertainties since they are all the same, therefor a total uncertainty of 0.02?
Iv also made a graph with these values and calculated the uncertainty in that using:
G/deltaG = 2 x delta Y / y2 - y1
(2) so i have an uncertainty in the graph and i assume i have to add that to my uncertainty of measurements to get the total uncertainty?
thanks for reading
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