A box plot summarizes a distribution with quartiles and whiskers, so you can compare spread, median, and outliers across groups at a glance. Each box spans Q1 to Q3 with a median line, while the whiskers reach the minimum and maximum.
The box runs from the first quartile to the third, so it holds the middle half of the values. The line inside is the median, and the whiskers reach out to the minimum and maximum.
When you want to compare the shape of several distributions side by side - test scores across classes, or response times across servers - and you care about spread and outliers, not just the average.
Each box is built from a five-number summary - minimum, first quartile, median, third quartile, and maximum - that you provide for every category.
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