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Choose a defensible sales chart

Visualization practice · A useful chart makes its units, population and limitations inspectable.

Learn → Try → ExplainReviewed 2026-10-15
01

Your task

Draw April EUR 300 and May EUR 400 as bars. What happens if the y-axis begins at EUR 290? Sketch the view and write an accessible text alternative.

02

Hint

Start with the decision and the comparison. Avoid decorative marks that compete with the evidence.

Worked solution

A truncated baseline exaggerates the relative height of bars. Start bars at zero, label EUR and show both periods. A line chart with a clearly labelled narrower scale can answer a different trend question, but disclose the scale.

04

Review checklist

Can someone recover the values, period, population and denominator from the chart and text? State one conclusion the evidence does not support.

Make the reasoning yours.

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