variation and standard deviation, what is or are, error bars?

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Error bars can be plotted on graphs and they indicate the values between which the true mean lies 

but what are they?

Posted Thu 31st January, 2013 @ 20:01 by Beth
Edited by Beth on Thu 31st January, 2013 @ 20:01

1 Answer

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They show you the percentage error of each value. Say you measured something but it had a 1mm error. When you draw the graph the error bar will be 1mm above and below the plotted point.

Answered Thu 31st January, 2013 @ 21:33 by Tilly - Team GR