Components of a box-and-whisker plot:

(1) Main title for the graph
(2) Horizontal line or line segment with a scale that accommodates the extremes of the data in equal intervals
(3) Vertical line at the median
(4) Vertical line at the lower quartile (median of the lower half)
(5) Vertical line at the upper quartile (median of the upper half)
(6) Point at the lower extreme (the least value in the data set)
(7) Point at the upper extreme (the greatest value in the data set)
(8) Rectangular box connecting both quartiles and containing the median
(9) "Whiskers" connecting the extreme points to the box

Print this Guideline (Acrobat 26k)