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AQA GCSE · Question 06.9 · Data Visualization and Representation
The Department of Transport produced this graph about HS2 in 2016 showing how journey times might change when HS2 is complete. Write down the name of this type of diagram.
The Department of Transport produced this graph about HS2 in 2016 showing how journey times might change when HS2 is complete. Write down the name of this type of diagram.
How to approach this question
Look at the structure of the chart. It uses bars to represent data. For each category (city), there are two bars being compared side-by-side. What is the name for this type of bar chart that compares multiple series?
Full Answer
Composite bar chart (or comparative bar chart).
This is a **composite bar chart**, also known as a comparative or multiple bar chart. It is used to compare two or more sets of data for different categories. In this case, the categories are the cities, and the two data sets being compared for each city are the "Current journey time" and the "Journey time when HS2 complete". The side-by-side bars make it easy to see the difference (the time saving) for each location.
Common mistakes
✗ Just "bar chart". This is not specific enough as there are several types (simple, composite, stacked).\n✗ "Dual bar chart" - while descriptive, the correct statistical term is composite or comparative.
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