Pick a topic
Each topic is a set of short tasks with instant feedback. Start anywhere, the order is up to you.
Dot size: points per task10 pts15 pts20 pts25 pts
Descriptive statistics
Variable types, frequencies, location, variability and the shape of a distribution. The foundation without which no table can be read.
Task difficulty: 8 easy, 17 medium, 3 hard
From a chart to a research question
How to turn data and a chart into a question worth investigating, and when a comparison of groups or an association between two variables really tells you something.
Task difficulty: 1 easy, 4 medium, 2 hard
Interpreting data
Percentages vs percentage points, misleading charts, correlation and causation. How to read the numbers in reports and presentations.
Task difficulty: 1 easy, 2 medium
Probability and inference
Conditional probability, false positives, p-values and confidence intervals without memorising formulas.
Task difficulty: 1 medium, 1 hard
AI literacy
How language models work, where they fail, how to verify their outputs and how to use them safely at work.
Task difficulty: 2 easy, 1 medium
Databases and SQL
The relational model, ERDs, keys and normalisation, then SQL queries that join tables and aggregate. You run the queries right in the browser.
Task difficulty: 1 easy, 4 medium