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 10.4 6.6 4.2 2.5 7.7 7.1 11.6 8.5 8.6 8.5 9.1 6.3 1.9 3.7 6.5 2.6

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