He introduced the box plot in his 1977 book,"Exploratory Data Analysis".
Connected means, as in figure 2, or box plots, are more appropriate for these data.
If there is a large number of observations, then a box plot may be preferable.
Some box plots include an additional character to represent the mean of the data.
Rarely, box plots can be presented with no whiskers at all.
If the data are normally distributed, the locations of the seven marks on the box plot will be equally spaced.
Several variations on the traditional box plot have been described.
The values can be represented using a modified box plot.
Overlaid on this box plot is a kernel density estimation.
A box plot or histogram may become more appropriate as the data size increases.