A line graph is constructed by connecting the data points with a line. It can be effectively used for depicting changes over time or space. This type of graph places more emphasis on trends and the relationship among data points and less emphasis on any p articular data point. 6.2 is an example of a line graph again using fictional data from Volunteer Creek. The proportion of each category is represented by the size of the wedge.
Pie charts are popular due to their simplicity and clarity.
Regardless of which graphic style you choose, follow these rules to ensure you use them most effectively. Each graph should have a clear purpose. The graph should be easy to interpret and should relate directly to the content of the text of a document or the script of a presentation. The data points on a graph should be proportional to the actual values so as not to distort the meaning of the graph. Labeling should be clear and accurate and the data values should be easily interpreted from the scales.