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Trends over time are generally shown in line graphs. The line graph plots the rise and fall of one data set

or multiple data sets. The line graph is needed when you want to show the effect of an independent

variable on a dependent variable. The second chart follows US wine import levels from Australia, Italy

and France over an eight-year period.

A pie chart is used to show how something relates to the whole. It usually deals with percentages. This

last chart shows the market share of the US cell phone market in 2008.

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