Someone Tells You That If You Say "Abracadabra" Every Morning

Multiple Choice

Someone tells you that if you say "abracadabra" every morning you will stay healthy. You say it daily, and, sure enough, you stay healthy. You conclude that saying this magic word really does ensure health. What error in thinking have you made?

A) failure to use the availability heuristic
B) inappropriate use of categorization-by-levels
C) over-reliance on base-rate information
D) premature commitment to one hypothesis