That's the whole point (it also shows the importance of having a control, by the way). When the supposed phenomenon you are attempting to measure has more than one causative agency, how can you possibly ascribe it to a single one as you had been doing? Further, if the results are indistinguishable from chance alone, what does that tell you? Be honest now.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'
