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 After 5.1 6.6 6.0 9.4 9.5 10.3 2.9 7.1 8.2 8.9 11.0 6.5 7.6 3.7 57 Construct a 95% confidence interval for the mean of the "before-after" differences. Hd (Round to two decimal places as needed.) 5.0 2.3