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Why should a bar chart's value axis start at zero?

  1. A Bar length encodes magnitude, so truncating the baseline exaggerates differences
  2. B It is a software requirement
  3. C It saves space
  4. D It improves colour contrast
Answer

Bar length encodes magnitude, so truncating the baseline exaggerates differences

Line charts showing change over time may reasonably not start at zero, because position rather than length carries the meaning.

All Data MCQs

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