tudy 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 erences 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 5.4 0.8 7.4 6.8 8.2 8.8 1.9 4.5 After 6.9 2.5 7.1 8.3 8.6 6.4 3.4 2.1 struct a 95% confidence interval for the mean of the "before - after" differences.

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