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In the 1930's, J. B. Rhine and Karl Zener from
the Duke University Psychology Department designed a deck of
25 cards to test for ESP. The deck consisted of five cards of
each symbol: Star, Circle, Wave, Square, and Cross. This on-line
test uses only 10 cards created using a random number generator.

Since there are only 5 different symbols, the chance of guessing
any one card is 1/5 (20%). On average, you should be able to
guess two symbols for the 10 cards displayed. The *significance
level* is calculated using a two-tailed statistical *t*
Test. The term "not significant" means that the results do not
differ substantially from what would be expected by chance.