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error bars

Asked by inthu5 | Mar 24, 2008 | AS Level > Biology > Coursework
inthu5 asks:

hi there
just wondering how do i construct error bars, and how do i analyse them, our teacher hasnt taught us how to do them, but we are expected to do them in our coursework, i've the internet but i dont understand what they mean by overlap either, would be grateful if you could help
thank you

etutor answers:
Error bars can be calculated in a number of different ways. I believe there is a way of getting Excel to calculate them (look in the help section if you have Excel). A relatively simple way is to may the error bar spread 1 x standard deviation above and below the point. A problem is that you really need quite a number of repeats (5 minimum, I would say) if the error bars are going to be meaningful.

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