2.8 2.3 3.2 2.6 n 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. Doe hypnotism appear to be effective in reducing pain? Before After 9.3 6.8 0.7 11.3 8.4 6.5 6.9 2.2 7.1 8.9 8.1 6.8 88 Construct a 95% confidence interval for the mean of the "before-after" differences.