https://mannhowie.com/cognitive-reflection-test
1. The Bat and Ball Problem
Problem:
- A bat and a ball cost $1.10.
- The bat costs $1.00 more than the ball.
- How much does the ball cost?
First Reaction:
Nearly all people have a first reaction of 10 cents which is wrong. The correct answer is 5 cents.
In a study of 3,428 university students, 50% of participants across Harvard, MIT and Princeton gave the incorrect intuitive response and did not actively check their response. A failure to check is instructive because it requires such minimal mental effort.
