Chapter Summary
Histograms and boxplots display the distributions of numerical variables. The bars of the histogram partition the range of the variable into disjoint intervals. The distribution can be either symmetric or skewed with a long tail reaching out to one side or the other. The histogram can be flat, called uniform; bell shaped with one mode; or split into two (bimodal) or more (multimodal) peaks. Stragglers on the edges of the distribution are known as outliers. The White Space Rule reminds you to think about the rest of your data when you find that an outlier dominates a graph.
Summary statistics quantify various attributes of the distribution. The median is the middle value of the distribution, and the mean is the average. These define ...
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