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This game is about:

SELF-TEST OF OVERCONFIDENCE

This game comes from Decision Traps by Russo and Schoemaker

Grab a piece of paper, and for each of the following ten items, write down a low and high guess such that you are 90 percent sure the correct answer falls between the two guesses. (This process will shortly be automated, until then...)

The challenge is to be neither too narrow (i.e. overconfident) nor too wide (i.e. underconfident). If you successfully meet this challenge you should have 10 percent misses - that is, exactly one miss. Verify your answers on the Answer Page.
Low High
1. Martin Luther King's age at death. ___ ___
2. Length of the Nile river (in miles). ___ ___
3. Number of countries that are members of OPEC. ___ ___
4. Number of books in the Old Testament (King James version). ___ ___
5. Diameter of the moon in miles. ___ ___
6. Weight of an empty Boeing 747 (in pounds). ___ ___
7. Year in which Wolfgang Amadeus Mozart was born. ___ ___
8. Gestation period (in days) of an Asian elephant. ___ ___
9. Air distance from London to Tokyo. ___ ___
10. Deepest (known) point in the ocean (in feet). ___ ___
and the answers are...