HAC Healthcare Data Visualization & Dashboards 1 — Questions and Answers
Question 1: Which type of chart is most appropriate for displaying a patient's vital sign trends over a 72-hour ICU stay?
- Pie chart
- Line chart (Correct answer)
- Bar chart
- Scatter plot
Correct answer: Line chart
Line charts are ideal for displaying continuous data over time, making them the best choice for tracking vital sign trends across a defined time period.
Question 2: A healthcare dashboard shows hospital readmission rates by department. Which visualization principle ensures viewers correctly interpret magnitude differences?
- Using 3D bar charts for visual depth
- Starting the Y-axis at zero (Correct answer)
- Sorting bars alphabetically
- Using rainbow color gradients
Correct answer: Starting the Y-axis at zero
Starting the Y-axis at zero prevents visual distortion of magnitude differences and ensures viewers accurately compare bar heights without being misled.
Question 3: In a population health dashboard, which chart type is best suited to show the distribution of patient BMI values across a large cohort?
- Stacked bar chart
- Histogram (Correct answer)
- Donut chart
- Bubble chart
Correct answer: Histogram
Histograms display the frequency distribution of a continuous variable like BMI, making patterns such as skewness and central tendency immediately visible.
Question 4: A clinical analyst wants to display the relationship between patient age and length of hospital stay. Which visualization is most appropriate?
- Scatter plot (Correct answer)
- Heat map
- Waterfall chart
- Gantt chart
Correct answer: Scatter plot
Scatter plots are designed to reveal correlations and relationships between two continuous variables, making them ideal for comparing age against length of stay.
Question 5: Which dashboard design principle advises grouping the most critical KPIs in the upper-left area of the screen?
- Gestalt principle of proximity
- F-pattern reading behavior (Correct answer)
- Color hierarchy principle
- Data-ink ratio rule
Correct answer: F-pattern reading behavior
Eye-tracking research shows users scan screens in an F-pattern, reading left-to-right then downward, so placing critical KPIs in the upper-left aligns with natural viewing behavior.
Question 6: A hospital executive dashboard uses red, yellow, and green indicators for metrics. What is this visualization technique called?
- Heatmap layering
- Traffic light / RAG status (Correct answer)
- Conditional banding
- Threshold flagging
Correct answer: Traffic light / RAG status
Red-Amber-Green (RAG) or traffic light status indicators provide instant visual cues about metric performance relative to defined thresholds.
Question 7: Which metric should be used to assess how efficiently a dashboard communicates data by minimizing unnecessary graphical elements?
- Pixel density ratio
- Data-ink ratio (Correct answer)
- Chart junk index
- Visual complexity score
Correct answer: Data-ink ratio
Edward Tufte's data-ink ratio measures the proportion of ink used to convey actual data versus decorative elements, with a higher ratio indicating a more efficient visualization.
HAC Healthcare Data Visualization & Dashboards 1
Which type of chart is most appropriate for displaying a patient's vital sign trends over a 72-hour ICU stay?