How are pie graphs useful? Pie graphs give us an overall impression of data. They are useful for comparing the proportions of categories. However, if more than eight segments are needed, the graph becomes difýcult to read, and it is better to use a bar graph. Unlike line graphs, pie graphs are not useful for showing a trend over time. A good pie graph: • has a clear and accurate title that explains the purpose of the graph • has segments that are either labelled directly or indicated using a colour key • includes percentages or raw ýgures • has segments drawn clockwise from largest to smallest, starting at 12 o’clock with the largest and ýnishing at 12 o’clock with the smallest, unless there is a segment for ‘other’, which is always last • includes the source of the data. 8.5.2 Showme How to complete a pie graph by hand You will need: • paper • apencil • a protractor • a ruler • coloured pencils • a data set — in this case, energy generated from renewables in Australia (see TABLE1 ). Model TABLE1 Percentage of electricity generated from renewables and non-renewable sources in Australia (2023) Renewable energy Percentage (%) Hydro 6 Solar 16 Wind 12 Bioenergy 1 Fossil fuels 65 Source: Department of Climate Change, Energy, the Environment and Water, https://www.energy.gov.au/energy-data/ australian-energy-statistics/renewables#:~:text=In%202023%2C%2035%25%20of%20Australia's,earlier%202022 %2D23%20ýnancial%20year.
Procedure Step1 Order the statistics from largest to smallest. If there is an ‘other’ category, put it last. Step2
If you have not been given percentages, you will need to calculate them. Add all categories together to give you your total ýgure. Divide each individual category by the total ýgure and then multiply by 100. This will give you a percentage.
Jacaranda Humanities Alive 7 Victorian Curriculum Third Edition
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