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 nterval for the mean of the "before - after" differences. Does hypnotism appear to be effective in reducing pain? Before 8.4 5.5 12.1 7.3 7.0 9.2 3.0 1.4 After 6.8 2.2 7.6 8.1 8.1 6.4 3.4 2.3 Construct a 95% confidence interval for the mean of the "before - after" differences.

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