These graphs are also complicated and require more care in their construction and more explanation in the text. Another type of graph is the scatter graph, which show a series of unconnected dots between variables. They can be used to show a relationship and sometimes a line is drawn through the dots to show this relationship. Other times they are used to show that there is no relationship between variables. They can also be plotted on logarithmic scales and require more explanation in the text than other types of graphs.
Bar graphs are simple to make and to understand.
They can show data without implying a relationship. The bars can be horizontal or vertical but should be laid out in the way that the reader expects them. When showing cause and effect data, it is better to use the horizontal axis for the independent variable and the vertical axis for the dependent variable. Bar graphs are the best for presenting data to general audiences. Pie charts are popular and used often.