DA0-002 Data Governance Practice Question
A data analyst creates a bar chart showing monthly sales for the current year. The CEO asks to see the same data but grouped by region. Which chart type is most appropriate for this new requirement?
⚠ Common exam trap
CompTIA often tests the distinction between grouped and stacked bar charts, trapping candidates who think any multi-category bar chart is equivalent, when in fact grouped bars are for comparing individual category values and stacked bars are for comparing totals and proportions.
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
✓
Grouped bar chart
A grouped bar chart is the most appropriate choice because it allows the CEO to compare monthly sales across different regions side by side within each month. This chart type effectively displays two categorical variables (month and region) and one quantitative variable (sales), making it easy to see both regional performance and monthly trends simultaneously.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Grouped bar chart
Why this is correct
A grouped bar chart plots a second categorical dimension—region—as clustered bars within each monthly group, so both month and region remain visible. A simple bar chart cannot encode the added region breakdown, and a stacked chart obscures per-region comparison.
- ✗
Pie chart
Why it's wrong here
A pie chart encodes parts of a single whole, so it cannot show sales across multiple regions alongside monthly progression without losing the time axis. Grouped bars handle two categorical dimensions. Pie charts suit a single snapshot of proportions, such as each region's share of total annual sales.
- ✗
Stacked bar chart
Why it's wrong here
A stacked bar chart places regional values on a shared cumulative column, so comparing individual regions requires reading segment lengths rather than aligned baselines. Grouped bars give each region its own bar per month. Stacking suits showing both regional composition and monthly totals together.
- ✗
Line chart
Why it's wrong here
A line chart implies a continuous progression, connecting points along an ordered axis, which misrepresents discrete regional categories. Regions have no inherent sequence. Line charts suit trends over time, such as monthly sales across the year, whereas grouped bars compare magnitudes between distinct categories.
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