Data Science Data Visualization and Communication 3

Question 1

Which chart is best for showing a trend in a continuous metric over time?

Accepted Answer

Line chart

Answer

Pie chart

Answer

Treemap

Answer

Heatmap

Question 2

A stakeholder says your dashboard is 'too busy.' Which action most directly addresses this?

Accepted Answer

Reduce clutter and highlight only the most relevant metrics

Answer

Add more KPIs to each panel

Answer

Increase color saturation everywhere

Answer

Add animated transitions

Question 3

Which encoding is generally perceived most accurately by the human eye (per Cleveland & McGill)?

Accepted Answer

Position along a common scale

Answer

Color hue

Answer

Area

Answer

Volume

Question 4

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

Accepted Answer

It can imply spurious correlation by arbitrary scaling

Answer

It cannot show two series

Answer

It is unsupported by all tools

Answer

It always crashes the browser

Question 5

Which visualization best displays the magnitude of values across two categorical dimensions simultaneously?

Accepted Answer

Heatmap

Answer

Single line chart

Answer

Pie chart

Answer

Histogram

Question 6

To accommodate colorblind viewers, what is the best practice?

Accepted Answer

Use colorblind-safe palettes plus shape or label redundancy

Answer

Use only red and green to distinguish series

Answer

Rely solely on color with no other cues

Answer

Remove all color

Question 7

What is the purpose of a histogram?

Accepted Answer

Show the distribution of a single continuous variable via bins

Answer

Show relationships between two variables

Answer

Show part-to-whole proportions

Answer

Show geographic data