In summary.

This article seems to re-affirm: You develop a theory and test it by making further observations and following scientific method. (which you should all have memorised)

However one criticism i have is of the statistics gained at the beginning. Surly the challenge is to develop an optimum theory to predict the right card most often. Surly this objective is the same no matter who is being tested, or how many people are being tested. The question would then become; what theory did you use to get your high score? And most answers would be; card counting.