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  1. Psi in a Skeptic's Lab: A Successful Replication of Ertel's Ball Selection Test.Suitbert Ertel - 2010 - Journal of Scientific Exploration 24 (4).
    In the Ball Selection Test for assessing psi, ping pong balls are drawn blindly from an opaque bag one at a time with replacement. Each ball has an integer from 1-5 and red or green dots marked on it, thereby producing 10 distinct alternatives. On each trial, a participant jumbles the balls, and attempts to guess both the number and the dot color on the ball prior to pulling it out of the bag. Because the 10 ball types are equally (...)
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