I am not very confident on this answer.

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% confidence interval for the mean of the "before - after" differences. Does hypnotism appear to be effective in reducing pain? Before 6.0 2.3 11.9 11.7 10.9 5.0 8.5 5.9 After 6.5 2.9 7.8 8.2 8.2 63 3. 7 2.2 Construct a 95% confidence interval for the mean of the "before - after" differences.