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A study was conducted to measure the effectiveness of a hypnotism in reducing pain. The measurements are centimeters on a pain scale before and after hypnosis.

before 9.7 6.0 10.4 11.2 8.1 5.6 5.7 0.2
After 6.9 2.4 7.8 8.5 8.4 6.8 3.5 2.1

Construct a 95% confidence interval for the mean of the "before-after" differences

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