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A graphical display to summarize the distribution of a sample. It displays five numbers plus (possibly) some outliers - those five points being the median, hinges (approximate quartiles), and the largest and smallest value not counting any points marked as outliers.
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How to assess skewness from a boxplot?
How to decide skewness by looking at a boxplot built from this data:
340, 300, 520, 340, 320, 290, 260, 330
One book says, "If the lower quartile is farther from the median than the upper quartile, then … I built a boxplot using R. It's like the following:
I take that it's negatively skewed, because the lower quartile is farther from the median than the upper quartile. …