Displaying the results

In this part of the examination, you will be required to analyse and evaluate the data recorded in the first part of the experiment.

Drawing graphs and charts

There are several methods for displaying the data, but usually you will have to draw a line graph.

Pie charts

Pie chart showing primary fuel production in the UK in 2016. The largest segment is Petroleum, followed by Gas, Nuclear, Bioenergy & waste, Wind, solar & hydro, and Coal.SOURCE: Department for Business, Energy and Industrial Structure

Pie charts can be used to show the make-up of something, when comparing to the total data. Each section is a category or name and the size of the pie segment represents a percentage of the whole. An example of this is how the UK electricity supply is met from different renewable and non-renewable sources, as a percentage of the total energy supplied.

Bar graphs

Bar graph titled How children in class 4B travel to school. The x axis is labelled Mode of transport, the y axis is labelled Number of children.

Bar graphs are used when the \text{x}-axis is a range of categories, names or labels (categoric variables) and the \text{y}-axis can take any numerical value (continuous variable). An example of this would be the height a golf ball bounces to when dropped on different surfaces. The bounce height is a continuous variable and the different types of surface are categoric variables. Bar graphs can also be drawn to display fixed or discrete numbers (discontinuous variables) on the \text{x}-axis, eg months in a year or the number of legs possessed by animals and insects (2, 4, 6, 8).

Line graphs

Line graph titled Time taken for a paper cake case to fall from different heights. The x axis is labelled Height (m), the y axis is labelled Time (s).

Line graphs are used when both axes are continuous variables because they can take any numerical value. An example of this might be a graph to show the time taken for a paper cake case to fall from different heights.