DAC Data Visualization & Reporting 3

Question 1

When should you use a line chart instead of a bar chart?

Accepted Answer

To show trends over continuous time

Answer

Line charts are ideal for showing how a value changes over continuous time.

Question 2

What is 'data-ink ratio' as described by Edward Tufte?

Accepted Answer

The proportion of ink used to display actual data versus decoration

Answer

Data-ink ratio measures how much of a chart's ink represents real data versus non-essential decoration.

Question 3

A stakeholder wants to compare the composition of total sales across five regions over four quarters. Which chart works best?

Accepted Answer

Stacked bar chart by quarter

Answer

A stacked bar chart by quarter shows both totals and regional composition over time.

Question 4

What is the main purpose of adding filters to an interactive report?

Accepted Answer

To let users focus on specific subsets of data

Answer

Filters allow users to narrow the view to relevant subsets of the data.

Question 5

Which practice improves the storytelling quality of a report?

Accepted Answer

Guiding the reader with annotations and a logical flow

Answer

Annotations and a logical narrative flow help readers interpret and act on the data.

Data Analytics Certifications (DAC) Practice Test