Errors Essay, Research Paper
Absolute Errors
Since no measurement is exact, there will always be the possibility of an error.
Numbers are often rounded off to a certain number of significant figures or
decimal places, and in such instances an absolute error can be calculated.
If the number 1200 is given to the nearest 100, for example, then the
number can be anything between 1150 and 1250. It can therefore be written
as 1200 ? 50. In this instance, the absolute error is 50.
In general, if a number is a ? b, then the absolute error is b . Relative Errors
The absolute error doesn’t really tell us much about how big the error
really is. For example, an absolute error of 1000 is very big if the number
we are talking about is 3000, but it is small if we are talking about 100
000 000 000. The relative error incorporates the number that we are talking
about.
If a number is a ? b, then the relative error is b/a Example
If 200 is correct to 2 significant figures, what is the relative error?
This can be written as 200 ? 5, since the highest number it could be is 205
and the lowest is 195. The relative error, therefore, is 5/200 = 1/40 =
0.025 . Percentage Error
Percentage error = relative error ? 100 © Matthew Pinkey
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