CompTIA Data+ (DA0-002)VisualizationHard
A data analyst is preparing a report for a retail company to illustrate the sales contribution of each product category to the total revenue for the previous year. The goal is to quickly show the proportion of sales generated by each category and identify the top-performing ones, especially if there are many categories. Which chart type would be MOST effective for this visualization?
- ALine chart
- BBar chart
- CTreemap
- DPie chart
Show answer & explanationAnswer & explanation
Correct answer: C. Treemap
While a pie chart shows parts of a whole, it becomes ineffective with many categories. A treemap is superior for visualizing hierarchical data or parts of a whole when there are numerous categories. It uses nested rectangles, where the size of each rectangle is proportional to its value (sales contribution), and categories can be further grouped, making it easy to identify top contributors and their relative proportions even with many items.
Why the other options are wrong
- A. Line charts are for trends over time, not for showing proportions of a whole.
- B. Bar charts are effective for comparing individual category values but less efficient at showing the part-to-whole relationship for many categories simultaneously compared to a treemap.
- D. Pie charts are suitable for a few categories but become unreadable with many, making comparison difficult.
Treemap
A visualization that displays hierarchical data as a set of nested rectangles, where the size of each rectangle is proportional to its value, and colors can represent categories or other attributes.
- Effective for showing parts of a whole with many categories.
- Good for identifying dominant categories at a glance.
- Can represent hierarchical structures efficiently.
Memory trick: Many pieces, one big whole, treemap helps to meet your goal.