CBDA Data Visualization & Communication 2 — Questions and Answers
Question 1: Which of the following BEST describes an executive dashboard in the context of business data analytics?
- A detailed data dictionary for the IT team
- A high-level summary of KPIs enabling quick strategic decisions (Correct answer)
- A full transactional database export
- A technical schema diagram
Correct answer: A high-level summary of KPIs enabling quick strategic decisions
An executive dashboard distills key performance indicators into a concise view that supports strategic decision-making.
Question 2: When a CBDA analyst uses 'small multiples,' they are applying which visualization technique?
- Displaying one large chart with all categories combined
- Creating several small charts with the same scale to compare across a variable (Correct answer)
- Using footnotes to explain each data point
- Filtering a chart to show only the top 5 results
Correct answer: Creating several small charts with the same scale to compare across a variable
Small multiples repeat the same chart structure for different subgroups, enabling side-by-side comparison.
Question 3: Which of the following is a key principle of effective data storytelling for business analysts?
- Present all available data to let the audience draw their own conclusions
- Lead with a clear insight and support it with evidence (Correct answer)
- Avoid visuals and use only written summaries
- Always start with methodology before showing results
Correct answer: Lead with a clear insight and support it with evidence
Effective data storytelling begins with the key insight, then uses evidence to support and contextualize it.
Question 4: In a business report, what is the purpose of 'annotation' on a chart?
- To increase the number of data points shown
- To add decorative elements to improve aesthetics
- To highlight specific data points or trends with explanatory text (Correct answer)
- To list the data source credentials
Correct answer: To highlight specific data points or trends with explanatory text
Annotations draw the audience's attention to key moments or outliers and provide direct explanatory context.
Question 5: A CBDA analyst notices that a bar chart misleads viewers by starting the Y-axis at 500 instead of 0. This is an example of which problem?
- Overplotting
- Truncated axis distortion (Correct answer)
- Outlier masking
- Spaghetti chart complexity
Correct answer: Truncated axis distortion
A truncated Y-axis exaggerates differences between bars, misleading the audience about the true magnitude of change.
Question 6: Which type of chart is BEST for displaying hierarchical data such as budget allocation broken down by department and then by project?
- Treemap (Correct answer)
- Line chart
- Box plot
- Control chart
Correct answer: Treemap
A treemap uses nested rectangles to represent hierarchical proportions, making it ideal for budget breakdowns.
CBDA Data Visualization & Communication 2
Which of the following BEST describes an executive dashboard in the context of business data analytics?