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Part 8:
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Histograms |
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Before you go any further, remind yourself of what a histogram looks like and what makes it different from an ordinary bar chart. A histogram is a quite specialised type of chart. You would not draw one if an ordinary bar chart would do, unless you were making a statistical analysis of some data. The horizontal scale must be a continuous scale, so if you are asked to illustrate a table like this one, say,
you would draw an ordinary bar chart because the 'year' scale is not continuous. The table shows totals for complete, discrete years, with no smooth flow between them. |
