Data Interpretation & Graphs

Bar charts, pie charts, line graphs, histograms — tools for visualising and interpreting data

Scotland 🌍 1786 Statistics

Key Facts

1
William Playfair (1786): invented bar chart, pie chart, line graph — modern data visualisation pioneers
2
Pie chart: parts of a whole (always 360°/100%); Bar: comparison; Line: trend over time; Histogram: frequency distribution
3
Key questions: what is the range? the trend? is there an outlier? what does the scale start at?

🔢 Did you know? William Playfair invented the bar chart (1786), pie chart (1801) and line graph (1786) — he created the entire visual vocabulary of statistics

Data Interpretation & Graphs

Key Facts

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