# 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

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 graphs are used when the -axis is a range of categories, names or labels (categoric variables) and the -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 -axis, eg months in a year or the number of legs possessed by animals and insects (2, 4, 6, 8).

### Line graphs

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.