Q: Why do you need graphs?

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Yes, without exception.

Well we use graphs to show parts compared to the whole. Graphs are important because they can show us percents, they can show us how much of something or whatever you may be talking about. For example, graphs are used to show the percent of people voting for which candidate in this years election.

Multivariate is probably the most accurate answers. Graphs need not be bivariate - you can have graphs in 3 or more dimensions - not easy to visualise in more than 3-d but that does not mean they cannot exist. Graphs need not represent exact relationships - as any scattergram will demonstrate. Graphs are simply visual representations of information, presented in a form that [hopefully] conveys he information in an effective way. For one of my favourite semi-numeric graphs follow the link to see a graphical representation of Napoleon's invasion of Rusia.

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line graphs bar graphs pictographs you are really sexy

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Yes, without exception.

There are many graphs which while you can usually use most of them no matter what experiment you are doing that is not always true, nor is it the right use of a graph. some of the most likely graphs you will probably come across , or for that matter need to use are bar graphs, line graphs, pie graphs, and picture graphs.

Well we use graphs to show parts compared to the whole. Graphs are important because they can show us percents, they can show us how much of something or whatever you may be talking about. For example, graphs are used to show the percent of people voting for which candidate in this years election.

All graphs need labels or data on both of the axis to be of use. So all graphs require a "key"

Multivariate is probably the most accurate answers. Graphs need not be bivariate - you can have graphs in 3 or more dimensions - not easy to visualise in more than 3-d but that does not mean they cannot exist. Graphs need not represent exact relationships - as any scattergram will demonstrate. Graphs are simply visual representations of information, presented in a form that [hopefully] conveys he information in an effective way. For one of my favourite semi-numeric graphs follow the link to see a graphical representation of Napoleon's invasion of Rusia.

I need help on this instead of looking at graphs...

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Bar graphs and line graphs do not. Straight line, parabolic, and hyperbolic graphs are graphs of an equation.

circle graphs add up to 100% , bar and line graphs don't

Line graphs and Bar graphs

All graphs are graphical graphs because if they were not graphical graphs they would not be graphs!