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St. dev and uncertainties in EE

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I'm currently working on my EE and now I came across a problem. When I plot a graph of my data, each dot is a mean of three data values. I wanted to put error bars on it, but I'm not sure what to use. If I used standard deviation, which is in biology syllabus, it can be calculated using 3 values only and I suppose this makes it pointless, doesn't it? On the other hand, I could calculate uncertainties. This would include huge calculations and many formulas. This is fine with me, since I understand all this stuff and it looks sophisticated and actually it is so.

So could you give me an advice, which is better to use in biology?



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