ABSTRACT
The purpose of using a graph is to tell others about a set of data quickly, allowing them to grasp the important characteristics of the data. In other words, graphs are visual aids to rapid understanding. It is therefore important to make graphs as simple and easy to understand as possible. The graph is known as a pie chart, because it depicts each category as a slice of pie, with the size of each slice varying according to its proportion of the whole pie. This can be useful for comparing individual categories with the total. Histograms are bar diagrams, where the areas of the bars are proportional to the frequencies in each group. These are especially useful for frequency distributions of grouped data. In a scatterplot, two measurements are each plotted on separate axes. The variable on the (horizontal) x-axis is usually called the independent variable, and the variable on the (vertical) y-axis is usually called the dependent variable.
