Box plot is devised into:
highest value 3rd quartile median 1st quartile lowest value
The box is made up of the
3rd quartile
median
1st quartile
The whiskers are the
highest and lowest value
Box length defines:
interquartile range
Median =
the middle 50%
line in middle of box
‘Whiskers’ (the lines) relate to the
range
Outliers are cases outside of the range: case numbers are listed so that you can identify them in the
data
Comparisons of box plots: look at differences in the:
Median Lower quartile Upper quartile Interquartile range Maximum