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stuck on this question. A study was conducted to measure the effectiveness of hypnotism in reducing pain. The measurements are centimeters on a pain scale

stuck on this question.

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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 11.0 12.5 After 68 Construct a 95% confidence interval for the mean of the "before - after" differences

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