A study was conducted to measure the effectiveness of hypnotism in reducing pain. The measurements are centimeters on a pain scale before and after hypnosis. Assume that the paired sample data are simple random samples and that the differences have a distribution that is approximately normal. Construct a 95% condence interval for the mean of the "before - after" differences. Does hypnotism appear to be effective in reducing pain? Before 8.8 7.2 8.1 7.7 8.6 5.9 4.0 0.9 D, After 6.2 2.4 7.8 8.9 8.1 6.2 3.5 2.6 E) Construct a 95% condence interval for the mean of the "before - after" differences. D