Lesson 7.1
Choosing a Chart Type
The chart follows the question. Comparison across categories suits bars, change over time suits lines, and relationships between two numeric variables suit scatter.
Lessons and exercises
Turning an analysis into something another person can read and trust. The technical content is small; the judgement about honest presentation is the substance.
Lesson 7.2
Labels and Scale
A chart without labelled axes and units is not interpretable. A truncated axis exaggerates differences and must be disclosed.
Lesson 7.3
Honest Presentation
Presentation choices carry claims. Aggregating away variation, hiding sample sizes, or picking a flattering range are all arguments made silently.
Lesson 7.4
Explaining a Result
A visualisation needs a sentence saying what the reader should take from it, and a good one states the limits as well as the finding.
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