CAP Data Visualization & Reporting 1 — Questions and Answers
Question 1: Which chart type is most appropriate for displaying the distribution of a continuous variable?
- Pie chart
- Histogram (Correct answer)
- Stacked bar chart
- Scatter plot
Correct answer: Histogram
A histogram displays the frequency distribution of a continuous variable by grouping values into bins, making it ideal for understanding data distribution.
Question 2: When visualizing the relationship between two continuous variables, which chart type is most commonly used?
- Box plot
- Treemap
- Scatter plot (Correct answer)
- Waterfall chart
Correct answer: Scatter plot
A scatter plot maps individual data points on two axes, making it the standard tool for visualizing correlations or relationships between two continuous variables.
Question 3: A CAP analyst wants to show how a total value breaks down into component parts over time. Which chart type is best suited?
- Stacked area chart (Correct answer)
- Bubble chart
- Gauge chart
- Heat map
Correct answer: Stacked area chart
A stacked area chart displays part-to-whole relationships over time by stacking the series values, enabling comparison of both individual components and total values.
Question 4: According to data visualization best practices, what is 'data-ink ratio' as defined by Edward Tufte?
- The ratio of colored ink to black ink in a chart
- The proportion of a graphic's ink devoted to displaying data versus non-data elements (Correct answer)
- The number of data points per square inch of chart area
- The ratio of axis labels to gridlines in a visualization
Correct answer: The proportion of a graphic's ink devoted to displaying data versus non-data elements
Tufte's data-ink ratio is the fraction of a chart's ink that actually represents data; maximizing it means removing unnecessary decorative elements to improve clarity.
Question 5: Which visualization is most effective for comparing values across multiple categories simultaneously, particularly when the number of categories is large?
- Donut chart
- Horizontal bar chart (Correct answer)
- Radar/spider chart
- 3D pie chart
Correct answer: Horizontal bar chart
Horizontal bar charts allow easy reading of long category labels and enable accurate length comparisons, making them superior for many-category comparisons.
Question 6: In dashboard design, what does KPI stand for and what is its primary purpose?
- Key Process Indicator — tracks operational workflow steps
- Key Performance Indicator — monitors progress toward strategic goals (Correct answer)
- Known Predictive Index — measures model accuracy over time
- Kernel Performance Index — benchmarks computing resource usage
Correct answer: Key Performance Indicator — monitors progress toward strategic goals
KPI stands for Key Performance Indicator; it is a quantifiable metric used to evaluate how effectively an organization or individual is achieving key business objectives.
Question 7: A box plot (box-and-whisker plot) displays which five summary statistics?
- Mean, median, mode, variance, range
- Minimum, Q1, median, Q3, maximum (Correct answer)
- Mean, standard deviation, skewness, kurtosis, range
- Minimum, mean, median, mean, maximum
Correct answer: Minimum, Q1, median, Q3, maximum
A box plot shows the five-number summary: minimum, first quartile (Q1), median, third quartile (Q3), and maximum, with whiskers extending to the data range.
CAP Data Visualization & Reporting 1
Which chart type is most appropriate for displaying the distribution of a continuous variable?