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16 16 Graph SkillsGraph Skills16 16 Graph SkillsGraph Skills
How to read and understand advanced types of How to read and understand advanced types of bar charts, area graphs, climographs and triangle bar charts, area graphs, climographs and triangle graphs graphs
How to advance their skills of drawing bar charts How to advance their skills of drawing bar charts
What do the colours represent?What does the red line represent?How do you ‘interpret’ these charts?
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Drawing bar chartsDrawing bar charts Simplest form of displaying statistical informationSimplest form of displaying statistical information Best method to use in the examsBest method to use in the exams
Chapter 16: Graph SkillsChapter 16: Graph Skills
The following steps should be taken toThe following steps should be taken to
construct a bar chart:construct a bar chart:
1.1. Always draw a bar chart on graph Always draw a bar chart on graph paper with a rulerpaper with a ruler
2.2. The bar chart should be given a The bar chart should be given a title from the information providedtitle from the information provided
3.3. The X-axis and the Y-axis should The X-axis and the Y-axis should be labelledbe labelled
4.4. If the Y-axis is numbered then If the Y-axis is numbered then have equal intervals between the have equal intervals between the values, for example 10, 20, 30, values, for example 10, 20, 30, etc. not 10, 25, 42, 50, etc.etc. not 10, 25, 42, 50, etc.
5.5. The bars on the bar chart should The bars on the bar chart should also be of equal width and colour also be of equal width and colour coded if time allows.coded if time allows.
Chapter 16: Graph SkillsChapter 16: Graph Skills
Marking scheme Marking scheme for bar charts is asfor bar charts is asfollows:follows:
Title: 2 marksTitle: 2 marks
Graph paper: 2 marksGraph paper: 2 marks
Scaled axis: 2 x 2, 4 marks in Scaled axis: 2 x 2, 4 marks in
totaltotal
Information plotted: 2 x 6, 12 Information plotted: 2 x 6, 12
marks in totalmarks in total
Chapter 16: Graph SkillsChapter 16: Graph Skills
