Data and Analytics Data Visualization 1 — Questions and Answers
Question 1: Which chart type is best for showing the distribution of a single continuous variable?
- Bar chart
- Pie chart
- Histogram (Correct answer)
- Line chart
Correct answer: Histogram
A histogram displays the frequency distribution of continuous data by grouping values into bins.
Question 2: What does a scatter plot primarily show?
- Trends over time
- Relationship between two numeric variables (Correct answer)
- Proportions of a whole
- Frequency of categories
Correct answer: Relationship between two numeric variables
A scatter plot displays the correlation or relationship between two continuous numeric variables using dots.
Question 3: Which visualization tool is most commonly used for business intelligence dashboards in the US?
- Matplotlib
- Tableau (Correct answer)
- Excel pivot tables
- R ggplot2
Correct answer: Tableau
Tableau is the leading BI dashboard tool in the US enterprise market, known for its drag-and-drop interface and interactive dashboards.
Question 4: What is a heat map used to represent?
- Geographic temperature data only
- Magnitude of values across two dimensions using color intensity (Correct answer)
- Categorical comparisons over time
- Network connections between nodes
Correct answer: Magnitude of values across two dimensions using color intensity
A heat map encodes data values as color intensity across a matrix, making it easy to spot patterns and outliers.
Question 5: Which principle of data visualization does Edward Tufte's 'data-ink ratio' emphasize?
- Using bright colors for emphasis
- Maximizing the proportion of ink used to display data (Correct answer)
- Adding gridlines for readability
- Including as many chart types as possible
Correct answer: Maximizing the proportion of ink used to display data
Tufte's data-ink ratio advocates removing all non-essential chart elements to maximize the proportion of ink conveying actual data.
Question 6: What chart type is most appropriate for comparing parts of a whole across multiple categories?
- Stacked bar chart (Correct answer)
- Scatter plot
- Box plot
- Waterfall chart
Correct answer: Stacked bar chart
A stacked bar chart shows how each category's total is composed of subcategories, enabling part-to-whole comparisons.
Data and Analytics Data Visualization 1
Which chart type is best for showing the distribution of a single continuous variable?