If you create charts with Excel, error bars allow you to visualize margins of error for data points. Here's how to add error bars in Excel.

Suppose you have some data. You want to plot that data and turn it in with your lab report. Your instructor (me) told you to be sure and include error bars on your graph.

How to Get Chart Bars to Show Red When the Value Is Less Than Zero in Excel?. When you create a chart in Excel using positive and negative values, both positive and negative graphs are the same ...