Bias experiments
Short experiments from published studies. Answer first, then see what was at work.
The length of the Rhône
Is the Rhône longer or shorter than 2,000 kilometres? Now give its length.
Two programmes, one epidemic
An epidemic threatens six hundred people. Two programmes, one budget. Which one do you sign?
2, 4, 6
The sequence 2, 4, 6 follows a hidden rule. Propose a triple and you will be told whether it follows. Five tries, then name the rule.
The cooking class
You paid €120 for a Saturday cooking class, non-refundable. The night before, a friend offers you a day out you would much rather have, and it costs nothing. What do you do?
One coin flip
A coin is flipped. Heads, you win €150; tails, you lose €100. One flip — do you take it?