DA0-002 Visualization and Reporting Practice Question
An analyst needs to show the part-to-whole relationship of market share among four competitors. Which chart type is most appropriate, considering best practices?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
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Pie chart
A pie or donut chart is suitable for part-to-whole with few categories (5-7 slices max). Here, four competitors fit well.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Pie chart
Why this is correct
A pie chart maps each competitor's slice to the whole market, so four segments clearly convey part-to-whole proportions. With only four categories, the slice count stays readable, satisfying best practise for showing market share composition without overwhelming the viewer.
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Scatter plot
Why it's wrong here
A scatter plot positions points on two numeric axes to reveal correlation between variables, and cannot encode four competitors' proportions of a single total. It is tempting because it displays quantitative relationships clearly, but that suits correlation or distribution analysis; part-to-whole requires a pie or stacked bar chart.
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Histogram
Why it's wrong here
A histogram bins one continuous variable into intervals and counts frequencies, so it shows distribution shape rather than each competitor's share of a total. It is tempting because it summarises numeric data visually, but that suits understanding spread or skew; part-to-whole needs a pie or stacked bar chart.
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Box plot
Why it's wrong here
A box plot summarises a distribution through median, quartiles and outliers along one axis, and cannot represent four competitors' proportions of a whole. It is tempting because it compares distributions compactly, but that suits spread and outlier analysis; part-to-whole requires a pie or stacked bar chart.
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