Average number of contractile vacuole expulsions in Paramecium under different environmental conditions. Average number of contractile expulsions per minute Baseline Saline Deionized Solution tested Figure 1. Use these instructions for graphing when your underlying independent variable (graphed on the X axis) is categorical, and you want your bar graph to illustrate average values for your dependent variable (on the Y axis), with error bars indicating standard deviation around the mean.
1 How to make a bar graph with error bars in Excel This document provides instructions for how to use Excel to produce a bar graph.
