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 7.7 6.4 2.5 2.4 8.9 7.2 C 13.2 8.3 Construct a 95% confidence interval for the mean of the "before-after" differences. << (Round to two decimal places as needed.) 11.3 8.2 9.1 6.9 8.7 3.8 5.2 2.8

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