DA0-002 Visualization and Reporting Practice Question
A data analyst wants to show the sales trend for a product over the past 12 months. Which chart type is most appropriate?
⚠ Common exam trap
Test-takers frequently confuse a histogram with a line chart because both use bars or lines to represent data, but a histogram is strictly for frequency distributions of continuous data, not for time-series trends.
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
✓
Line chart
A line chart is the most appropriate choice because it explicitly shows data points over a continuous time interval, making it ideal for visualizing the sales trend over 12 months. The x-axis represents time (months), and the y-axis represents sales values, allowing the audience to easily see upward, downward, or cyclical patterns. This aligns with the core principle of time-series visualization, where line charts excel at highlighting trends and changes over sequential periods.
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 this is correct
Line charts effectively show trends over time.
- ✗
Bar chart
Why it's wrong here
Bar charts compare categories, not trends over time.
- ✗
Pie chart
Why it's wrong here
Pie charts show part-to-whole relationships, not time trends.
- ✗
Histogram
Why it's wrong here
Histograms show distribution of a continuous variable, not trends over time.
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