Graphs: A graph or chart is defined as the pictorial representation of statistical data in graphical form. The graphs are used to represent a set of data to make it easier to understand and interpret statistical information.
Diagrams: A diagram is a visual form for presenting statistical data for highlighting the basic facts and relationships which are inherent in the data.
Difference Between Graphs and Diagrams
| Graphs | Diagrams |
| 1. Graph paper is used for the preparation of graphs | 1. Plain paper is used for drawing or construction of diagrams. |
| 2. It represents the mathematical relationship between two variables. | 2. It does not show any relationship in variables. |
| 3. Graphs are commonly used to represent frequency distributions. | 3. Diagraphs are not used for frequency distributions. |
| 4. Graphs are commonly used by the researcher for the analysis of data. | 4. Diagrams are not useful for the analysis of data. |
| 5. For example: Line graph, frequency. | 5. For example: Pie diagram, bar diagram, curves. |
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