Jan 24: Assignment 2 Questions

1. In page 526 (efficacy), the real and the sham acupuncture groups are statistically insignificant for a number of pain parameters just by seeing the graphs (fig 2, 3 and 4) without by using any statistical inference ? It is not clear for me and how is it possible ?

2. In page 524, the author used an unpublished pilot trial to determine the sample size for his study and he don't specify how long ago the pilot study has done. Is the pilot trial valid  ?