Similarities
- Both are simple and attractive.
- both can give condensed form to data.
- Both help to compare the variables.
Differences
- Diagrams are good even for a layman but not the graphs.
- Value of Median and Mode can be determined by graph but not by diagram.
- Diagrams are often drawn on plain paper whereas graphs on graph paper.
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Image Source: vectorfree.com/media/vectors/diagrams-and-graph-vectors.jpg