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Scale activity

Scale activity

The activity for an example of a graph with a misleading scale is based on discussion questions and then a redrawn graph.

This is one type of a misleading graph. The activity begins with a discussion about the graph. Students are then asked to write about the same information when the graph is drawn accurately.

Average house prices

Discussion points

  • What is the headline?
  • Glancing at the graph, by how much do you think house prices have risen?
  • What do you notice about the vertical scale on the graph?
  • Why is the representation misleading?
  • Why do you think a newspaper would produce a graph such as this?

Activity

This graph has used the same information but with a correct scale.

Average house prices

 

Now imagine you are a journalist about to write an article. What would the headline be? 

Write a paragraph for the newspaper using the mathematical information. Include the approximate percentage rise in prices.

Further activity

Collect graphs that appear in your local media. Are any misleading or confusing?

Yes

Yes