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Presenting numerical data using graphs. There is a wide range of graphs that are suitable for presenting numerical data. Those most frequently used are summarised in Table 12.1 along with when to use them. Those shaded in Table 12.1 are those graphs you are most likely to use. You will probably have less use for those graphs not shaded.
Table 12.1 Graphs for presenting numerical data and when to use them

Graph	Use when you want to present data to
Histogram	show frequency of occurrence and emphasise highest and lowest categories for one variable show the distribution of categories for one variable (frequencies are normally displayed vertically and categories horizontally and the data values will need to be grouped into categories)
Line graph	show the trend for one variable over time
Multiple line graph	compare the trends for two or more variables over time
Scatter graph	show the relationship between the individual cases for two variables
Frequency polygon	show frequency of occurrence and emphasise highest and lowest categories for one variable show the distribution of categories for one variable (frequencies are normally displayed vertically and categories horizontally, and the data values will need to be grouped into categories)
Box plot	show the distribution of values for one variable and present statistics such as the median, quartiles, range and inter-quartile range
Multiple box plot	compare the distribution of values for two or more variables and present statistics such as the median, quartiles, range and inter-quartile range