MS-DS Master of Data science Master of Data science Data Visualization and Communication 1

Question 1

Which color scale is most appropriate for representing data that has a meaningful midpoint, such as temperature anomalies above and below average?

Accepted Answer

Diverging color scale

Answer

Diverging color scales use two contrasting hues radiating outward from a neutral midpoint, making them ideal for data with a meaningful center value where both directions of deviation need to be visually distinguished.

Question 2

A data scientist wants to show how a company's market share changed across five product categories over three years. Which visualization is most suitable?

Accepted Answer

Grouped bar chart

Answer

A grouped bar chart allows direct comparison of multiple categories across multiple time periods simultaneously, making it easy to see both within-year category differences and year-over-year trends for each category.

Question 3

What is the primary purpose of a tooltip in an interactive data visualization?

Accepted Answer

To reveal precise values for specific data points on hover

Answer

Tooltips provide exact underlying values when a user hovers over a data point, balancing clean overall chart design with the ability to access precise details on demand without cluttering the visual.

Question 4

When communicating uncertainty in a model's predictions to a business audience, which visual element is most commonly used?

Accepted Answer

Confidence interval bands or error bars

Answer

Confidence interval bands and error bars directly encode the range of uncertainty around a central estimate, giving non-technical audiences an intuitive sense of prediction reliability without requiring statistical expertise.

Question 5

Which principle of Gestalt psychology explains why data points placed close together are perceived as belonging to the same group in a scatter plot?

Accepted Answer

Proximity

Answer

The Gestalt principle of proximity states that objects near each other are perceived as a group; in scatter plots, clustered points naturally appear as distinct groupings because of their spatial closeness.

MS-DS Master of Data science Practice Test

MS-DS Master of Data science Practice Test

MS-DS Master of Data science Master of Data science Data Visualization and Communication 1