The "box" and whisker plot represents what

Box-and-whisker plots are a handy way to display data broken into four quartiles, each with an equal number of data values. The box-and-whisker plot doesn't show frequency, and it doesn't display each individual statistic, but it clearly shows where the middle of the data lies. It's a nice plot to use when analyzing how your data is skewed.

There are a few important vocabulary terms to know in order to graph a box-and-whisker plot. Here they are:

Q1 - quartile 1, the median of the lower half of the data set

Q2 - quartile 2, the median of the entire data set

Q3 - quartile 3, the median of the upper half of the data set

IQR - interquartile range, the difference from

Q3 to Q1 Extreme Values - the smallest and largest values in a data set