a bar graph
Anytime.
data are not alway numbers sometimes it have letters in it.
BAR ;)
in a chart or graph
A+ statistical comparison
a bar graph
A point can represent a piece of data or an (x,y) value.
The numbers on the bottom of a graph usually represent the independent variable, which is typically time or some other factor being measured. These numbers help to place the data points in context along the x-axis and provide a scale for interpreting the information presented in the graph.
The answer depends very much on the sort of data and on what information the graph is meant to convey.
Anytime.
A pie graph represent data as a part of a whole, showing the separate portions of the data in accordance to the whole.
It all depends on what kind of bar graph your're making, and also for what data your putting on it !
data are not alway numbers sometimes it have letters in it.
to represent and compare datas to it.
BAR ;)
in a chart or graph