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Interpreting a truncated scale

Interpreting a truncated scale

Secondary 2
4 marks
TGM Original Questions

The diagram shows 48 visitors to Library A and 50 visitors to Library B on one day.

  1. A reader says Library B had about twice as many visitors as Library A. Explain how the diagram may have caused this impression.[2]
  2. Calculate the percentage by which the number at B exceeded the number at A, correct to 1 decimal place.[1]
  3. State one change that would give a fairer visual comparison.[1]

Solution:

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Answer:(a) The axis starts at 45 and exaggerates the difference. (b) \(4.2\%\). (c) Start the frequency axis at zero.

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