Error Calculation in Large Set of Data

Master J
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I perform a set of measurements x. This is performed for different values of y, ie. each value of y has a set of x values. Each measurement has an error associated with it.

There is also the value Dx, which is the difference in 2 x values. This has an error of twice the error of x.

I then need to plot the average value of x.Dx for each y value, against that y value.

My question is, how do I work out the error in this x.Dx that is to be plotted??
 
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Why do you need errors to plot the average xDx? Did you mean "plot the error of xDx"?
 
Sorry, perhaps its confusing. I am plotting that average, but the errors would be for the error bars!
 
Can you post part of your data (or an example that looks like your data), and how you are constructing x.Dx?
 

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