Describe Best Practices for Planning and Creating Effective Data Visualizations DATA-SCIENCE-FOUNDATIONS Practice Questions (Page 5)

Questions 21–24

1. 21foundation · easy

   A data scientist creates a bar chart showing average customer satisfaction scores. To maintain data integrity, what should the visualization include?

   • AA 3D effect to make the chart stand out
   • BA legend that explains the color scheme
   • CThe sample size or confidence interval for each bar
   • DA title that states the source of the data
   Reveal Solution Discussion Select an answer first
2. 22application · medium

   An analyst is creating a visualization for a public health report showing the mortality rate of a disease across 50 states. The audience includes policymakers and the general public. The analyst wants to highlight states with the highest rates. Which design choice is most appropriate?

   • AUse a diverging color scale with red for high and green for low
   • BUse a sequential color scale from light to dark on a choropleth map
   • CUse a bar chart instead of a map to avoid any geographic bias
   • DUse a rainbow color scale to make all states visually distinct
   Reveal Solution Discussion Select an answer first
4. 23application · medium

   A team has built a dashboard for a group of financial analysts. After a first review, the analysts say they cannot quickly find the key performance indicators they need. According to best practices for iterative design, what should the team do next?

   • AAdd more charts to the dashboard so all possible metrics are visible
   • BAssume the analysts will learn the layout over time and make no changes
   • CAsk the analysts to write a list of all metrics they might ever need
   • DConduct a short usability session where analysts perform typical tasks while the team observes
   Reveal Solution Discussion Select an answer first
5. 24foundation · easy

   A data visualization has been reviewed by a focus group. Based on their feedback, the analyst decides to change the chart type from a pie chart to a bar chart. This action is an example of which best practice?

   • ASelecting a chart type for the first time
   • BDefining the visualization goal
   • CIterating based on stakeholder feedback
   • DEnsuring data accuracy
   Reveal Solution Discussion Select an answer first