2min chapter

Choiceology with Katy Milkman cover image

Invisible Failures: With Guests Emily Oster, Sendhil Mullainathan & Linda Rodriguez McRobbie

Choiceology with Katy Milkman

CHAPTER

The Zener Card Test

The Zener card test was actually simpler compared to using regular playing cards. In a deck of 52 cards, you start out with a 1 in 52 chance of guessing the right card. If the volunteer knew all the symbols and could count cards, the test would get progressively easier as cards were eliminated.

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