A headline under the lens
A coincidence can have several explanations. What would you check?
Fictional case: during summer, ice-cream sales and swimming-pool visits increased. A headline says “Buying ice cream makes people visit the pool.” Choose the two most useful checks before accepting that cause.
What you will practise: Separate association, alternative explanations and causation.
Think it through together
One person proposes a strategy; the other asks “why?” and looks for a case where it fails. Then swap roles. No names or speed competition needed.
Before viewing the explanation: what do we know, what are we assuming, and how would we check the result?