BLC
Year 7
Data & Datasets
Where data comes from, and three real datasets to practise with.
Primary vs secondary data
Primary data
Data you collect yourself, first-hand — like a class survey or a tally chart you fill in.
Secondary data
Data someone else already collected, that you use — like the football or weather datasets below.
Downloadable datasets
Click a heading to jump to its preview, or use the download button to save the file.
⚽ premier_league_2024.csv
Top 6 Premier League clubs from the 2023–24 season.
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🌦️ uk_weather_2024.csv
Average UK weather figures by month.
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📱 popular_apps_2024.csv
Popular apps, their category, monthly users and main age group.
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Tips for cleaning data
- Check for typos in category names — "Man Utd" and "Man United" would be counted separately by mistake.
- Look for blank cells — decide whether to fill them in or remove that row.
- Watch for outliers — a value miles away from the rest might be a typing mistake.
- Make sure numbers are stored as numbers, not text, or formulas like SUM won't work.