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OneSome fictional exampleexamples to show
RandomGroup did a survey to find out what countries the public supported in the 2010 South Africa World Cup. The sample size was 100. The results were collated and are as follows:
25% of the people surveyed supported Brazil.
30% of the people surveyed suppoted England.
10% of the people surveyed supported Argentina.
of the peoplepeo ple surveyed supported
3% of the people surveyed supported South Korea.
2% of the people surveyed supported Portugal.
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The results can be shown in different forms:
Bar Graph

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These are some other things to take note of when handling statistics.
Take note of your sample group. If it is too small, data might be unreliable. If it is too big, data collation would take a very long time.
Choose the right form to collect and present the statistics. For instance, venn diagrams are only useful when there are crossovers within the data. The three most common knids of graphs are the line graphs, the bar graphs and the pie chart. The line graph is used to show information that is connected, for example over a period of time. The bar graph is used to show relative sizes of different results while the pie chart is used most often to show results in percentages.
Label the units. If you use the wrong units, readers may misunderstand your data and your data will become inaccurate. Units make your presentation clearer and better.
Make sure that your presentation is neat and readable. It will not help if you add in too much information and make your graph look messy and confuse the readers. One way you can do this is by allocating different colours for each data group.
Remember to name your graph so that the audience knows what you are presenting about.
For your reference, some websites used to plot your own graph:
Bar graph, line graph and pie chart: http://nces.ed.gov/nceskids/createagraph/
Venn diagram: http://www.pangloss.com/seidel/Protocols/venn.cgi
Stem and leaf diagram: http://www.mrnussbaum.com/graph/sl.htm

Pie Chart
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From these presentations, we can calculate the mean, median, mode and some ratios regarding the data collected.
Mean of the percentage of people who support a country: 100/7= 14.3 (3sf)
Median: 2, 3, 10, 15, 15, 25, 30
Mode: 15 (appears twice)
Ratio of people supporting Brazil to people supporting England: 5:6
Ratio of people supporting European countries to other countries: 31:19
A class of 25 pupils sat for an English, a Math and a Science test and the results are as of follows:
Pupils who scored an A1 for English: Capello, Barry, Lennon, Rooney, Cole, Terry, Ferdinand, Johnson, Gerrard, Lampard, Carrick, Philips, Wright, Hart

Pupils who scored an A1 for Math: Capello, Berbatov, Ronaldo, Wiltord, Barry, Lampard, Gerrard, Rooney, Ferguson, Messi, Giggs, Lennon
Pupils who scored an A1 for Science: Capello, Boateng, Drogba, King, Ferguson, Messi, Carrick, Cole, Giggs
The results can be represented in the form of a venn diagram:
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Pie Chart
{pie_chart.jpg}
A class of 25 pupils sat for an English, a Math and a Science test and the results are as of follows:
Pupils who scored an A1 for English: Capello, Barry, Lennon, Rooney, Cole, Terry, Ferdinand, Johnson, Gerrard, Lampard, Carrick, Philips, Wright, Hart
Pupils who scored an A1 for Math: Capello, Berbatov, Ronaldo, Wiltord, Barry, Lampard, Gerrard, Rooney, Ferguson, Messi, Giggs, Lennon
Pupils who scored an A1 for Science: Capello, Boateng, Drogba, King, Ferguson, Messi, Carrick, Cole, Giggs