Perception and Visualization DATA-SCIENCE-OPTIMIZE Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   Which Gestalt principle explains why a viewer perceives a series of dots arranged in a curved line as a single continuous path?

   • AProximity
   • BClosure
   • CSimilarity
   • DContinuity
   Reveal Solution Discussion Select an answer first
2. 17application · medium

   A data analyst creates a bubble chart to show the relationship between GDP (x-axis), life expectancy (y-axis), and population (bubble size) for 20 countries. The analyst notices that the largest bubble (China) overlaps several smaller bubbles, making them difficult to see. What is the most effective way to address this issue?

   • AIncrease the size of all bubbles proportionally to make them larger
   • BUse a pie chart instead to show the population of each country
   • CIncrease the transparency (alpha) of the bubbles so overlapping points remain visible
   • DRemove the largest bubble from the chart to avoid overlap
   Reveal Solution Discussion Select an answer first
4. 18application · medium

   A financial analyst is creating a heatmap to show the correlation between 10 stock returns. The analyst wants to use color to encode the correlation values, which range from -1 to +1. Which color scheme is most appropriate?

   • AA categorical color scheme with a different color for each correlation value
   • BA rainbow color scheme with red for -1 and violet for +1
   • CA diverging color scheme (e.g., blue-white-red) with white at zero correlation
   • DA sequential color scheme (e.g., light to dark blue) for all values
   Reveal Solution Discussion Select an answer first
5. 19expert · hard

   A UX researcher is designing a dashboard for a control room. The dashboard monitors multiple systems and must alert operators to anomalies. The researcher wants to use pre-attentive attributes to draw attention to the most critical alerts. The dashboard is already dense with information. Which strategy is most effective for ensuring critical alerts are noticed quickly?

   • AUse a unique color (e.g., red) for critical alerts and ensure it is not used elsewhere on the dashboard
   • BUse the same color for all alerts, but make critical alerts slightly larger
   • CUse a blinking animation for critical alerts
   • DPlace critical alerts in a fixed location at the top of the dashboard
   Reveal Solution Discussion Select an answer first
6. 20application · medium

   A data scientist needs to visualize the relationship between two continuous variables: house price (in dollars) and square footage. The goal is to identify whether a linear relationship exists and to spot outliers. Which visual encoding and chart type are most appropriate?

   • AScatter plot with position on both axes (x = square footage, y = price)
   • BPie chart showing the proportion of houses in each price range
   • CBar chart with price on the y-axis and square footage on the x-axis
   • DLine chart with square footage on the x-axis and price on the y-axis
   Reveal Solution Discussion Select an answer first