These questions are designed to accompany the Survey of Eighth Graders and their Favorite Desserts Starter File.
1 Paolo made a pie-chart of the dessert column and was surprised to discover that Fruit was the most popular dessert among 8th graders!
Make the pie-chart in Pyret to see what he’s looking at. Why is this display misleading? How is the data "dirty"?
2 What ideas do you have for how the survey designer could have made sure that the data in the dessert column would have been cleaner?
3 Make a data visualization showing the ages of the 8th graders surveyed. What "dirty" data problems do you spot and how are they misleading?
4 What ideas do you have for how the survey designer could have made sure that the data in the age column would have been cleaner?
5 Experiment with making data visualizations for other columns. What other issues can you spot? What other suggestions do you have for how the survey could have been improved?
These materials were developed partly through support of the National Science Foundation, (awards 1042210, 1535276, 1648684, 1738598, 2031479, and 1501927). 
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