Error Charts or Error Bars graphically represent the variability of data. They are typically used on graphs in order to display an error or to point out uncertainties in a reported measurement.
An Error Chart gives a general idea of how precise a certain measurement is, or conversely, how far from the reported value the true (error-free) value might be.
Usually a Bar Chart, a Line Chart, or a Dot Charts is drawn and then customized with Error Bars.
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