A randomized control trial tested the effectiveness of self-hypnosis on pain intensity after knee replacement surgery. Power analysis indicated a required sample size of 15 patients per group, and the significance level was set at p <.05. A total of 22 patients were recruited and randomly assigned to either hypnosis training or usual care. Results showed a mean difference of 0.5 points on the numeric pain rating scale (0-10) postoperatively, p = 0.24. What are your conclusions about this study? (Select all that apply.) The sample size may have been too small to detect statistically significant differences between the groups. The results did not support the hypothesis that self-hypnosis lowers pain intensity after knee replacement. Self-hypnosis significantly lowered pain intensity after knee replacement surgery. The results supported the hypothesis, but 0.5 points on the numeric rating scale is not deemed clinically significant