You want to display error bars on data series in your charts.
You can display error bars for a series by opening the Format Data Series dialog box. Select the series and press Ctrl-1. Click the Y Error Bars tab to specify how you'd like the error bars displayed. You can choose to display plus or minus bars or both. Further, you can specify the error as a fixed value, a percentage of the value being plotted, or as custom values in a cell range you provide. Figure 4-20 (in Recipe 4.9) shows an example data series with error bars.
Getting Acquainted with Visual Basic for Applications
Collecting and Cleaning Up Data
Time Series Analysis
Curve Fitting and Regression
Numerical Integration and Differentiation
Solving Ordinary Differential Equations
Solving Partial Differential Equations
Performing Optimization Analyses in Excel
Introduction to Financial Calculations