Question

A marketing analyst builds a dashboard chart plotting monthly website visits on a left axis and monthly revenue on a right axis, then scales each axis independently so the two lines appear to move together almost perfectly. A senior manager reviews it and concludes that visits directly cause revenue. Which best describes the primary design problem the analyst should correct?

Accepted Answer

The independently scaled dual axes create the visual impression of a stronger relationship than the data supports, potentially misleading viewers.

Answer

A line chart is never appropriate for time-series data and should be replaced with a stacked bar chart.

Answer

The chart should include a third axis so all metrics can be compared on the same scale.

Answer

The chart is fine as designed because two aligned lines prove a causal relationship.