16 Graph Skills

1. 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

2. Stacked bar chart

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

5. Trend graph

8. Pie charts

10. Climograph

13. Triangle graph

15. 0

17. Triangle graphs 100 0 0 100 0 100 0 100 100 0 3 numbers always add up to 100% 0 100

18. Bar charts

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

20. 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. Chapter 16: Graph Skills

21. 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

23. Exam questions