DAC Data Visualization & Reporting 2 — Questions and Answers
Question 1: Which chart type is most appropriate for showing the correlation between two continuous variables?
- Pie chart
- Scatter plot (Correct answer)
- Stacked bar chart
- Donut chart
Correct answer: Scatter plot
A scatter plot plots two continuous variables against each other to reveal correlation.
Question 2: A dashboard designer wants to reduce cognitive load. Which principle should guide the layout?
- Add as many KPIs as possible
- Use a different color for every element
- Follow a clear visual hierarchy (Correct answer)
- Animate all charts continuously
Correct answer: Follow a clear visual hierarchy
A clear visual hierarchy guides the eye to the most important information first, reducing cognitive load.
Question 3: What is the primary risk of using a truncated y-axis (not starting at zero) on a bar chart?
- It saves space
- It exaggerates differences between values (Correct answer)
- It improves color contrast
- It speeds up rendering
Correct answer: It exaggerates differences between values
Truncating the y-axis visually exaggerates small differences and can mislead viewers.
Question 4: In reporting, what does a 'drill-down' capability allow a user to do?
- Export the report to PDF
- Navigate from summary data to more detailed data (Correct answer)
- Change the color theme
- Schedule email delivery
Correct answer: Navigate from summary data to more detailed data
Drill-down lets users move from aggregated summaries into finer levels of detail.
Question 5: Which color consideration is most important for accessibility in dashboards?
- Using bright neon shades
- Ensuring sufficient contrast and colorblind-safe palettes (Correct answer)
- Matching the company logo exactly
- Using at least ten hues
Correct answer: Ensuring sufficient contrast and colorblind-safe palettes
Sufficient contrast and colorblind-safe palettes ensure charts are readable by all users.
Question 6: A KPI card on a dashboard should primarily display what?
- A detailed table of raw records
- A single key metric with context like a trend or target (Correct answer)
- A full narrative paragraph
- Every dimension in the dataset
Correct answer: A single key metric with context like a trend or target
KPI cards highlight one important metric, often with a comparison or trend for context.
Question 7: Which of the following best describes a heat map?
- A chart showing values as color intensity across a matrix (Correct answer)
- A line chart of temperature over time
- A geographic map with pins
- A pie chart split by percentage
Correct answer: A chart showing values as color intensity across a matrix
A heat map encodes values as color intensity across a grid or matrix.
DAC Data Visualization & Reporting 2
Which chart type is most appropriate for showing the correlation between two continuous variables?