Data Science Data Visualization and Communication 2

Question 1

Which chart type is most appropriate for showing the part-to-whole composition of a single category at one point in time?

Accepted Answer

Pie chart

Answer

A pie chart shows how parts make up a whole for a single categorical breakdown.

Question 2

You want to compare the distribution and outliers of salaries across five departments. Which visualization is best?

Accepted Answer

Box plot

Answer

A box plot summarizes median, quartiles, and outliers across multiple groups for easy comparison.

Question 3

Which color palette is most appropriate for a diverging metric like temperature anomaly centered on zero?

Accepted Answer

Diverging two-hue palette

Answer

Diverging palettes use two contrasting hues around a meaningful midpoint to show deviation in both directions.

Question 4

What is the main reason to avoid truncating the y-axis (not starting at zero) on a bar chart?

Accepted Answer

It can exaggerate differences and mislead viewers

Answer

Truncated axes on bar charts visually exaggerate small differences, misleading the audience.

Question 5

Which visualization best reveals the correlation between two continuous variables across many observations?

Accepted Answer

Scatter plot

Answer

A scatter plot maps two continuous variables to axes, revealing correlation and clustering patterns.

Data Science Practice Test