DSE DSE - Data Science Data Visualization and Communication 2

Question 1

Which business intelligence tool is most widely used for creating interactive dashboards without coding?

Accepted Answer

Tableau

Answer

Tableau is an industry-standard BI platform that allows analysts to build interactive, shareable dashboards through a drag-and-drop interface.

Question 2

In Edward Tufte's framework, what does a high 'data-ink ratio' indicate about a visualization?

Accepted Answer

Most of the ink conveys actual data rather than non-essential embellishments

Answer

Tufte's data-ink ratio principle states that unnecessary ink (gridlines, borders, decorations) should be minimized so the visualization focuses attention on the data itself.

Question 3

Which color scale is most appropriate for visualizing data that diverges around a meaningful midpoint (e.g., profit/loss)?

Accepted Answer

Diverging two-hue scale

Answer

A diverging color scale uses two contrasting hues that meet at a neutral midpoint, making it easy to distinguish positive and negative deviations.

Question 4

What is the primary purpose of a Q-Q (quantile-quantile) plot in data analysis?

Accepted Answer

Assessing whether a dataset follows a specific theoretical distribution

Answer

A Q-Q plot compares the quantiles of sample data against the quantiles of a reference distribution to assess how well the data fits that distribution.

Question 5

Which visualization is most effective for displaying trends of multiple categories over time on the same chart?

Accepted Answer

Multi-line time-series chart

Answer

A multi-line chart plots each category as a separate line over a shared time axis, making it easy to compare trends and relative changes simultaneously.

DSE - Data Science Practice Test

DSE - Data Science Practice Test

DSE DSE - Data Science Data Visualization and Communication 2