Boxplots display univariate, quantitative data. The data is ordered and placed into quartiles. Quartiles 1 and 4 are represented by the whiskers, and quartiles 2 and 3 (called the Interquartiles, since they represent the middle 50% of the data) are represented by the boxes.
We can CUSS about the boxplot because they show center (the median), outliers (via the 1.5 outlier test), shape (look for symmetric versus skewed), and spread (look at the range or the interquartile range).
Problem Set 2 was given out in class today. Check tomorrow's blog post for hints for question 1.
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