Perception and Visualization DATA-SCIENCE-OPTIMIZE Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   Which practice is most effective for reducing cognitive load in a data visualization?

   • AAdding a detailed legend for every color used in the chart
   • BRemoving non-essential elements such as gridlines and borders
   • CIncluding all available data points to provide complete information
   • DUsing a 3D effect to make the chart more visually engaging
   Reveal Solution Discussion Select an answer first
2. 12application · medium

   A human resources analyst wants to show the distribution of salaries across different departments in a company. The data includes 8 departments, and the analyst wants to highlight the median, quartiles, and any outliers in each department. Which chart type is most appropriate?

   • APie chart showing the proportion of total salary per department
   • BBox plot (box-and-whisker plot) for each department
   • CStacked bar chart showing the total salary per department
   • DLine chart showing the average salary trend over time
   Reveal Solution Discussion Select an answer first
4. 13expert · medium

   A data analyst needs to visualize the relationship between three variables: age (continuous), income (continuous), and gender (categorical, 2 levels). The analyst wants to show the distribution of income by age for each gender, and also highlight any outliers. Which chart type is most appropriate?

   • AA pie chart with gender as the only variable
   • BA scatter plot with age on the x-axis, income on the y-axis, and gender encoded by color
   • CA line chart with age on the x-axis and income on the y-axis, with a separate line for each gender
   • DA stacked bar chart with age groups on the x-axis and income on the y-axis
   Reveal Solution Discussion Select an answer first
5. 14application · medium

   A retail analytics team needs to show the regional sales manager how the proportion of total revenue contributed by each of 12 product categories has changed from Q1 to Q4. The manager wants to compare both the overall revenue growth and the shifting category shares in a single view. Which chart type should the analyst use?

   • ALine chart with 12 separate lines, one per category
   • BPie charts side by side, one for each quarter
   • CStacked bar chart with quarters on the x-axis and revenue on the y-axis
   • DGrouped bar chart with 12 bars per quarter
   Reveal Solution Discussion Select an answer first
6. 15foundation · easy

   What is the primary purpose of using a sequential color scale in a heatmap?

   • ATo ensure the visualization is accessible to colorblind viewers
   • BTo highlight a midpoint in the data
   • CTo represent ordered numeric values from low to high
   • DTo distinguish between categorical groups
   Reveal Solution Discussion Select an answer first