Graphs are used to show data visually. There are four different kinds of graphs you may use when presenting data. One is a bar graph, or a column graph. Bar graphs are used to show amounts, or a number of times a value occurs. Another graph you could use is a line graph. Line graphs plot data changes over a rate of time. The data points can show you the changes between the data. Scatter plot graphs show trends in data, and you can use this when you have a large number of data points. There a positive correlation in the data when the best fit line increases. When the best fit line decreases, there is a negative correlation. Line graphs and scatter plot graphs are almost the same, except that line graphs have connected dots and scatter plot graphs don't. You can use a pie chart to show a percent of a particular item. These are also called circle graphs. Pie charts, however, don't use a vertical or horizontal axis.
