A study was conducted to investigate the effectiveness of hypnotism in reducing pain. Results for randomly selected subjects are given below. The measurements are in centimetres on a pain scale. At the 0.01 significance level, test the claim that hypnotism has no effect.

Use the Wilcoxon signed-ranks test.

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Subject Before hyposs 6.6 6.5 9.0 0.3 3 8 6.3 11.6 After hypnosis 6.8 2.4 7.4 8.5 8.1 6.1 3.4 2.0 Based on "An Analysis of Factors That Contribute to the Efficacy of Hypnotic Analgesia," by Price and Barber, Journal of Abnormal Psychology, Vol. 96, No. 1.