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S1 Histograms

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					                    S1 Histograms

 Histograms are similar to bar charts apart from the
                consideration of areas.
In a bar chart, all of the bars are the same width and
 the only thing that matters is the height of the bar.
   In a histogram, the area is the important thing.

   It is best that Histograms are plotted against frequency
                       density or relative frequency density.

     They should also only be drawn with continuous data.

  Discrete or qualitative data can be plotted in Bar Charts
      but their bars should not really touch as they aren't
                                                 connected

If the class widths are uneven you will need to plot them
against frequency density rather than just frequency.

Frequency Density = Class Frequency
                      Class Width

Class Width x Frequency Density = Class Frequency




  Exercise 2B Q3, 4, 7, 9, 10, 11, 12

				
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