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Instrumental uncertainty and standard deviation


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I am really confused about the idea of uncertainty.

 

So for my raw data I need to include instrumental uncertainties for the columns. For my processed data I can to include standard deviation.

 

But for the process data, I need to also include instrumental uncertainties? How can I combine uncertainties with standard deviation?

 

So say for the final graph, should I use the error bars to represent SD or instrumental uncertainties? Because SD is also uncertainties??

 

 

I am really confused..

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