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Formatting a Series
Excel 2007 makes it easy to add error bars: You select one series in the chart and choose
Layout, Error Bars, More Error Bar Options. In the Format Error Bars dialog, you can
choose whether the error bars should extend up, down, or both from the line. You can add
a cap or have no cap. In the lower section, you can specify one of five methods for calculat-
ing the size of the error bar. You can specify that the error bars should extend a fixed num-
ber of units, base this on standard deviation, and so on. In the sales and operations planning
meetings, it was appropriate to add an error bar that was 20% of each data point. Thus, ...