A misleading graph

A misleading graph

Secondary 4
4 marks
TGM Original Questions

The chart shows the numbers of bottles collected for recycling in April and May.

  1. Calculate the percentage increase from April to May, correct to 3 significant figures.[2]
  2. A pupil says, “The bar for May is twice as tall, so the number of bottles doubled.” Explain why the chart makes this claim appear convincing and why the claim is false.[2]

Solution:

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Answer:(a) \(11.1\%\) (b) The axis starts at \(400\); doubling the displayed bar height does not double the actual count.

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