Lesson 10 min 20 XP
Misleading Charts
How visual tricks — truncated axes, cherry-picked time frames, and manipulated scales — distort data presentations.
Truncated Y-Axes
One of the most common tricks is starting the y-axis at a value other than zero. A bar chart showing approval ratings from 48% to 52% will make a 4-point difference look enormous, while the same data plotted from 0% to 100% shows a barely visible change.
This technique is not always dishonest — sometimes small differences matter and a truncated axis helps readers see them. But it is frequently used to exaggerate trends. Always check the axis labels and ask whether the visual impression matches the actual magnitude of the difference.