Monday, July 23, 2012

Histogram


A histogram shows two sets of numerical data using bars of different heights.  In a histogram one set of data deals with a count of non-discrete numbers occurring (frequency). The other set involves continuous or presumed continuous numerical data (e.g. measurement of length, percentage, measurement of mass).  Although histograms look similar to what is known as bar charts, a histogram groups numbers into ranges, while in a bar chart each bar is a specific number.  In the above histogram you can see that the histogram does in fact group the numbers into ranges (as seen on the x axis).

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