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phys: expand error bar requirements

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eggy 2020-09-26 14:58:09 -04:00
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@ -123,10 +123,12 @@ See [Dealing with Uncertainties](/resources/g11/physics-uncertainties.pdf) for h
### Error bars
Error bars represent the uncertainty of the data, typically representing that data point's standard deviation, and can be both horizontal or vertical. A data point with uncertain values is written as $(x ± \Delta x, y ± \Delta y)$
Error bars represent the uncertainty of the data and can be both horizontal or vertical. They are almost always required for both the independent and dependent variables. A data point with uncertain values is written as $(x ± \Delta x, y ± \Delta y)$
<img src="/resources/images/error-bars.png" width=600>(Source: Kognity)</img>
If the error bars of a data point are too small to see, note at the bottom of the graph that error bars are too small to see.
### Uncertainty of gradient and intercepts
!!! note "Definition"