Data Science Data Science Data Visualization and Communication Questions and Answers 3

Question 1

What is the main risk of using a dual-axis chart with two different y-axis scales?

Accepted Answer

It can mislead viewers into seeing correlations that do not exist

Answer

It always violates accessibility standards

Answer

It cannot display more than two data series

Answer

It requires logarithmic scaling on both axes

Question 2

Which color palette type is most appropriate for representing ordered quantitative data from low to high?

Accepted Answer

Sequential palette

Answer

Diverging palette

Answer

Qualitative palette

Answer

Categorical palette

Question 3

When building a dashboard for stakeholders, what is the recommended practice for the number of key metrics displayed?

Accepted Answer

Limit to 5-7 key metrics to avoid cognitive overload

Answer

Display as many metrics as possible for completeness

Answer

Always show exactly 3 metrics per section

Answer

Include only one metric per dashboard page

Question 4

What is a small multiples visualization technique?

Accepted Answer

Displaying the same chart type repeated for different subsets of data using a shared scale

Answer

Creating one large chart that combines all data subsets into a single view

Answer

Using miniature pie charts inside a larger bar chart

Answer

Reducing chart size to fit more visualizations on one screen

Question 5

Which metric is most useful for evaluating the accessibility of a data visualization for colorblind users?

Accepted Answer

Whether the visualization remains interpretable under simulated color vision deficiency

Answer

The total number of colors used in the chart

Answer

The brightness contrast between the background and the title text

Answer

The file size of the exported image

Question 6

What is the purpose of adding annotations to a time series chart in a data science report?

Accepted Answer

To highlight specific events or anomalies that explain changes in the data

Answer

To increase the data-ink ratio of the visualization

Answer

To replace the need for axis labels and legends

Answer

To make the chart compatible with screen readers