DSE DSE - Data Science Data Visualization and Communication 2 — Questions and Answers
Question 1: Which business intelligence tool is most widely used for creating interactive dashboards without coding?
- Matplotlib
- Tableau (Correct answer)
- Seaborn
- ggplot2
Correct answer: Tableau
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?
- More decorative elements are used
- Most of the ink conveys actual data rather than non-essential embellishments (Correct answer)
- The chart has a dark background
- The dataset has many variables
Correct answer: Most of the ink conveys actual data rather than non-essential embellishments
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)?
- Sequential single-hue scale
- Diverging two-hue scale (Correct answer)
- Qualitative categorical palette
- Grayscale only
Correct answer: Diverging two-hue scale
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?
- Comparing two time series
- Assessing whether a dataset follows a specific theoretical distribution (Correct answer)
- Plotting two categorical variables
- Visualizing cluster assignments
Correct answer: Assessing whether a dataset follows a specific theoretical distribution
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?
- Grouped bar chart
- Multi-line time-series chart (Correct answer)
- Scatter plot matrix
- Treemap
Correct answer: Multi-line time-series chart
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.
Question 6: A violin plot is best described as a combination of which two visualizations?
- Bar chart and scatter plot
- Box plot and kernel density estimate (Correct answer)
- Histogram and line chart
- Pie chart and box plot
Correct answer: Box plot and kernel density estimate
A violin plot merges a box plot (showing median and quartiles) with a mirrored kernel density estimate, providing both summary statistics and distribution shape.
DSE DSE - Data Science Data Visualization and Communication 2
Which business intelligence tool is most widely used for creating interactive dashboards without coding?