Error bars on a graph indicate variation in a set of data around the average.
The uncertainty or change of the corresponding coordinate of the point is shown by an error bar, which is a line drawn through a point on a graph that is parallel to one of the axes. The standard deviation of a data set is most frequently represented by the error bars in IB Biology.
Confidence intervals, standard errors, standard deviations, and other values may be displayed by error bars. Figure legends must specify what error bars are meant to depict because different error bar kinds provide very different information.
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