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You would use a bar graph to show data changes over time or to show comparisons among items. A line graph can also be used to show data changes over time or comparisons.

A pie/circle graph would be used to show the relative amount/size of items in a data set.

A scatter plot is used to show trends and similarities in a large number of data points.

This link might be useful too.

http://office.microsoft.com/training/training.aspx?assetid=rc011097791033&ofcresset=1

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12y ago
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13y ago

If the data is discrete, you use a bar graph; if it's continuous then you use a line graph or a histogram.

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