A chart should answer a question with readable units and an appropriate comparison. Bars, lines and scatterplots serve different purposes.
Before you begin
Use fictional or properly licensed data with a documented question, units and column definitions.
Work through the idea
State the decision or learning question first. Keep raw inputs separate from derived tables and document filters, exclusions and calculations. Check at least one result manually and record a limitation. Communicate what the evidence supports without inventing business outcomes or exposing personal information.
- Name the comparison
- Choose the chart type
- Label axes and units
Practice task
Make one chart comparing fictional categories and another showing change over time.
Check your result
Explain what each chart shows and one conclusion it does not support.
A mistake to avoid
Do not use a decorative chart when a small table communicates the values more clearly.
Keep a review note
Save the inputs or scenario, your reasoning and the result you checked. Explain one assumption and one case that needs more work. Revise the exercise after feedback and distinguish what you demonstrated from what remains untested.
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