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Setting two pie charts of government revenue side by side for two different years is criticised as an error. Why?
APie slices cannot be labelled with percentages
BPie charts always need at least ten categories
CPie slices are ranked rather than measured
DTotal revenue changes but the pie size is fixed
Answer & Solution
Correct answer: D. Total revenue changes but the pie size is fixed
1. A pie chart shows each component as a share of one fixed whole.
2. Total revenue is not the same in the two years, yet both pies are drawn the same size.
3. A slice that grows may therefore stand for a smaller amount of money, so the pieces cannot be compared meaningfully.
4. Labelling slices with percentages is normal practice and is not the fault being named here.
_Source: OpenStax Introductory Business Statistics (CC BY 4.0), Ch 2 "Descriptive Statistics", section 2.1 Display Data_
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