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The first step in every investigation of data is to make an appropriate graph. Many analyses of data begin with visualizing the distribution of a variable, and this requires that you know whether the variable is numerical or categorical. When interpreting these graphics, you should pay attention to the center, the spread, and the shape. Often, you will come across graphics produced by other people, and these can take extra care to interpret. In this section, we warn you about some potential pitfalls when interpreting graphs and show you some unusual visualizations of data.