16 Graph Skills How to read and understand advanced types of bar charts, area graphs, climographs and triangle graphs How to advance their skills of drawing bar charts

Stacked bar chart

What do the colours represent? What does the red line represent? How do you ‘interpret’ these charts?

Trend graph

Pie charts

Climograph

Triangle graph

3 numbers always add up to 100% Triangle graphs 100 100 100 100 100 3 numbers always add up to 100% 100

Bar charts

Simplest form of displaying statistical information Chapter 16: Graph Skills Drawing bar charts Simplest form of displaying statistical information Best method to use in the exams

The following steps should be taken to construct a bar chart: Chapter 16: Graph Skills The following steps should be taken to construct a bar chart: Always draw a bar chart on graph paper with a ruler The bar chart should be given a title from the information provided The X-axis and the Y-axis should be labelled If the Y-axis is numbered then have equal intervals between the values, for example 10, 20, 30, etc. not 10, 25, 42, 50, etc. The bars on the bar chart should also be of equal width and colour coded if time allows.

Marking scheme for bar charts is as follows: Title: 2 marks Graph paper: 2 marks Scaled axis: 2 x 2, 4 marks in total Information plotted: 2 x 6, 12 marks in total Chapter 16: Graph Skills

Exam questions