The interquartile range (IQR) is a statistical measure of the middle values of a sample data set that is separated into four equal parts. This middle-value grouping can provide a median range ...

Learn how to calculate the interquartile range from a variety of different data types and draw and interpret box-and-whisker diagrams.

The dot plot, decoded When the central bank releases its Summary of Economic Projections each quarter, Fed watchers focus obsessively on one part in particular: the so-called dot plot.