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.