They can be used in Marketing and Finance. They can also be used for co-ordinates or distance speed time graphs can be useful for journeys
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graphs are to compare and contrast data
A data series refers to a set of related values or observations that are organized in a specific order. It can be used to represent trends, patterns, or relationships over time or across variables. Data series are commonly used in graphs, charts, or visualizations to present and analyze data in a structured and organized manner.
The graph that is most used for categorical data is the pie chart. Bar graphs have also been used for categorical data.
Many people find it easier to take in information when it is presented in visual form. Graphs and charts are often not much use for the actual analyses but may help suggest the sort of analyses that should be carried out.