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# % errors, error analysis watch

1. How do i work out the % error of a gradient? (on Excel preferably)
2. you can do regression analysis, or least square fitting, or chi squared etc. There are many ways
3. (Original post by franniexo)
How do i work out the % error of a gradient? (on Excel preferably)
You're going to need to tell us a bit more. Did you measure the x and/or y values? What was the accuracy of measurement? What are you actually trying to do?
4. (Original post by franniexo)
How do i work out the % error of a gradient? (on Excel preferably)
Also what is this for? GCSE maths? A level?
5. (Original post by Mr M)
You're going to need to tell us a bit more. Did you measure the x and/or y values? What was the accuracy of measurement? What are you actually trying to do?
Well, i have data from an experiment which i've done and i've plotted a graph on it, i found the gradient and intercept using the regression table & its errors, however I'm not sure whether those errors are already in % or whether i need to work out % using those values.

Hope this makes sense
6. (Original post by Darth_Narwhale)
Also what is this for? GCSE maths? A level?
7. oh okay, the error will be an absolute value, not a percentage, and will be one standard deviation. In other words, about 68% of your data will lie within that range. (this is assuming your errors are random and hence gaussian)

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