DA0-002 Visualization and Reporting Practice Question
A data analyst wants to show the relationship between advertising spend and sales revenue for 50 stores. Which chart type is most appropriate?
⚠ Common exam trap
Candidates often confuse a line chart (which connects points in sequence) with a scatter plot (which treats points as independent observations), leading them to incorrectly choose a line chart when no temporal or ordered dimension exists.
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
✓
Scatter plot
A scatter plot is the most appropriate chart for showing the relationship between two continuous variables—advertising spend and sales revenue—across 50 stores. Each point on the plot represents one store, allowing the analyst to visually assess correlation, trends, or outliers. This aligns with the DA0-001 objective of selecting visualizations that best represent bivariate relationships.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Line chart
Why it's wrong here
A line chart implies a continuous sequence, typically time, so it misrepresents 50 independent stores as an ordered progression. It is tempting because it shows trends well, but it would be correct for tracking advertising spend and revenue over successive months instead of across discrete stores.
- ✓
Scatter plot
Why this is correct
Advertising spend and sales revenue are two continuous numeric variables, and the analyst wants their relationship across 50 stores. A scatter plot places one variable on each axis, revealing correlation, clusters and outliers that bar or line charts cannot show.
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Bar chart
Why it's wrong here
A bar chart compares categorical magnitudes, not the correlation between two continuous variables across 50 stores. It is tempting because bars display paired values clearly, but it would be the right choice for comparing sales totals across regions rather than showing spend-versus-revenue correlation.
- ✗
Pie chart
Why it's wrong here
A pie chart shows parts of a single whole, so it cannot plot two continuous variables per store. It is tempting because it displays proportional breakdowns attractively, but it would be correct for showing each store's share of total revenue, not the spend-revenue relationship.
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