1) A graphical display of data using bars of different heights good way to show relative sizes 2) A way of showing data using images. Each image stands for a certain number of things 3) A special chart that uses “pie slices or sectors” to show relative data sizes. It's a good way to show relative sizes at a glance. 4) first hand data that a researcher has gathered. 5) data that we collected by someone else.

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