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# Historgram anyone? watch

1. How do you 'do' a histogram? and what do they show
2. They're like a bar chart, except frequency is determined by the area of the bars not their height. Take the frequency and divide it by the class width to get the height of the bar. They're supposedly useful if you have classes of different sizes, but from my experience I see no real uses.
3. You don't have to divide by the class width. If they are all of class width 10 except for one which is 20 then you can just divide the one which is 20 by 2, as long as you state that the standard class width is 10 next to the graph.

The "point" is that when viewing a graph you are influenced by the area and not the height of the bars. For example, if you have a really big class with a frequency of 10 and a small class with a frequency of 10, your brain will think that the large class has a lot more values in it than the small one if you do not have a standard class width.

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Updated: December 20, 2005
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