Error Charts or Error Bars are a graphical representation of the variability of data and are used on graphs to indicate the error, or uncertainty in a reported measurement. They give a general idea of how precise a measurement is, or conversely, how far from the reported value the true (error free) value might be. Usually Bar Chart, Line Chart or Dot Chart are drawn and then customized with an Error Bar. Error Bars often represent one standard deviation of uncertainty, one standard error, or a certain confidence interval.
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