Bar graphs are a way of visually representing data
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A bar graph IS a chart.A bar graph IS a chart.A bar graph IS a chart.A bar graph IS a chart.
To Tell whether which is which. For example let's say you have a red bar and blue bar, how are people going to know which is which? So that's the purpose of the key.
a bar graph is just a graph but a double bar graph compares 2 things!
The graph key is to make sure everyone understands what things mean, like a map key
For an ordinary bar graph you need two variables, the dependent variable being numerical. You need at least two observations - unless you want a bar graph that serves no purpose. You could have more than one dependent variables for a stacked or grouped bar graph.