Peter draws this graph to show the duration of his monthly outgoing calls (in minutes) for the last three months. State one aspect of the graph that may be misleading and explain how this may lead to a misinterpretation of the graph.

Misinterpretation Analysis interpretation 中文

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Worked solution

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1. State one misleading aspect of the graph

The vertical axis has no tick marks or numerical scale shown.

2. Explain how this could cause misinterpretation

Without a scale, the reader cannot accurately compare the bar heights. The increase from $150$ to $200$ to $250$ minutes may therefore appear exaggerated or understated.

Answer

One misleading aspect is that the vertical axis has no scale markings. This makes it difficult to judge the actual heights of the bars, so a reader may wrongly think the increase in call duration from month to month is larger or smaller than it really is.

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Peter draws this graph to show the duration of his monthly outgoing calls (in minutes) for the last three months. State one aspect of the graph that may be misleading and explain how this may lead to a misinterpretation of the graph.

Worked solution

16

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