Algorithm for Witches
An 'algorithm' with 100% sensitivity for detecting witches simply labels everyone a witch, illustrating false positives.
Use this cartoon
Free for classrooms, worksheets, slides and other non-commercial use under CC BY-NC 4.0, with credit to Ben Orlin.
Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2018-10-25-algorithm-for-witches/ (CC BY-NC 4.0)Transcript
A: "I've created an algorithm that identifies 100% of witches! Check it out!"
B (reading: "1. WITCH ALERT 2. IT'S A WITCH 3. GET THAT WITCH"): "Algorithm? This is just a blanket accusation."
A: "Only drawback: it occasionally labels non-witches as witches..."