Data Detective: Spot the Misleading Chart

Objective

Build the habit of questioning numbers and charts before using them in decisions.

Materials

• A pack of eight to twelve printed charts with short claims, some fair and some misleading (prepare in advance or use public examples)
• Answer sheets and pens
• A timer and a simple scoreboard

Step by step

1. Explain the challenge: for each chart, decide whether the claim is supported and, if not, why.
2. Split into teams of three to five and hand out the chart packs.
3. Give teams 20 minutes to work through the charts and write down their verdicts and reasons.
4. Go through the answers together, scoring a point for each correct verdict and a bonus for naming the exact trap.
5. Ask teams which traps they have seen in their own reports.
6. Agree two or three questions everyone will ask before trusting a chart at work.

Facilitator tips

• Include a few charts that are perfectly fine, so teams do not assume every chart is a trick.
• Common traps: truncated axes, missing comparison, percentages of tiny numbers, correlation presented as cause, and selective time periods.

Variations

• Ask teams to create their own misleading chart from honest data, then swap.
• Use anonymised charts from your company's past reports.

Accessibility

Seated table activity. Print charts in large format and use patterns as well as colours for participants with colour-vision deficiency.