Perception and Visualization DATA-SCIENCE-OPTIMIZE Practice Questions (Page 5)

Questions 21–25

1. 21foundation · easy

   Which of the following is an example of a pre-attentive attribute in data visualization?

   • AThe angle of a pie slice
   • BThe length of a bar in a bar chart
   • CThe position of a point along a common scale
   • DThe color hue of a data point
   Reveal Solution Discussion Select an answer first
2. 22application · medium

   A healthcare dashboard displays patient status categories (Admitted, Discharged, Transferred, Deceased) on a map of hospital wards. The visualization team wants to use color to encode the status. The dashboard will be used by clinicians who may have red-green color vision deficiency. Which color scheme should be used?

   • AUse a rainbow spectrum with each category assigned a different color
   • BUse a colorblind-safe categorical palette (e.g., blue, orange, green, purple) with distinct lightness values
   • CUse a red-green diverging palette with red for Admitted and green for Discharged
   • DUse a single-hue sequential palette from light to dark for all categories
   Reveal Solution Discussion Select an answer first
4. 23application · medium

   A data analyst creates a bar chart showing average monthly sales for two product lines. The y-axis starts at $40,000 instead of $0. The analyst wants to highlight the difference between the two lines. What is the primary concern with this chart?

   • AThe chart violates the Gestalt principle of proximity
   • BThe truncated y-axis exaggerates the perceived difference between the bars
   • CThe chart should use a pie chart instead to show the difference
   • DThe chart uses an inappropriate color scheme
   Reveal Solution Discussion Select an answer first
5. 24application · medium

   A logistics company wants to present a weekly operations report to executives. The report must show: (1) the number of shipments per day, (2) the average delivery time per day, and (3) the percentage of on-time deliveries per day. The executives are busy and need to grasp the key trends quickly. What is the most effective approach?

   • ACreate three separate simple line charts, one for each metric, and place them in a single row
   • BUse a 3D bar chart with three bars per day, one for each metric
   • CCombine all three metrics into a single line chart with three lines and a legend
   • DCreate a single table with all three metrics per day
   Reveal Solution Discussion Select an answer first
6. 25foundation · easy

   Why is using a 3D pie chart generally considered a visualization pitfall?

   • AIt makes the chart look more professional
   • BIt can distort the perceived proportions of the slices
   • CIt requires too much computing power to render
   • DIt makes the chart harder to print
   Reveal Solution Discussion Select an answer first