This links to quartiles
-You must have a scale base
-Draw a line at the number which is the lowest value of the data
-Draw a line at the number which is the median of the lower quartile
-Draw a line at the number which is the median of the data
-Draw a line at the number which is the median of the upper quartile
-Draw a line at the number which is the highest value of the data
-Draw a line at the top and bottom end of the lines drawn joining the median of the lower quartile to the median of the upper quartile making a box
-Finally draw a short line joining the middle of the edge of the box on one end to the highest value and the same for the opposite side but instead to the lowest value
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