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it is often difficult to solve complicated problems alone
No. Often a graph will be of figures from a table and often the table will appear with it, but they are different. Many graphs do not relate to tables at all.
Error bars are often used on graphs to show statistical comparisons.
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.
A graph is a visual representation of numerical or other information, often used for comparative purposes. Mathematical graphs include those in geometry that indicate points, lines, and curves within a Cartesian coordinate system. Other types of graphs (bar graphs, pie graphs) display numerical values or percentages as lengths or areas, and may use colors to indicate the data for more than one set of values.