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This assignment emphasizes precise thinking and language. Students are often insensitive to the units of measure employed in data presentation. They might look at a graph displaying GDP trends and claim that GDP is falling, when, in fact, the rate of growth has simply declined. They have similar problems with totals and averages.Unfortunately, it is apparent that students do not grow out of this problem naturally. Our department's advisory board complains loudly about the "sloppy thinking" that characterizes young hires. They go on and on about how junior members of their teams prepare terrible numerical graphics for presentations and then go on to talk about the poor quality of data contained in these presentations—wrong units, wrong periods, bad conclusions.In order to receive a good grade on this assignment, students need to be sensitive to the units of measure in each source and be precise in what they need to measure. Also, because students are often insensitive to selection bias, they need to be aware of how dependent results can be to the sample selected for observation.

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