*10. Refer to Case Study 22.1, concerning the ganzfeld procedure for testing ESP. In earlier studies using the ganzfeld procedure, the results were mixed in terms of whether they were statistically significant. In other words, some of the experiments were statistically significant and others were not. Critics used this as evidence that there was really nothing going on, even though more than 5% of the experiments were successful. Typical sample sizes were from 10 to 100 participants.

Give an explanation for why the results would have been mixed.