In Exercises 920, assume that the paired sample data are
Chapter 9, Problem 19(choose chapter or problem)
In Exercises 920, assume that the paired sample data are simple random samples andthat the differences have a distribution that is approximately normal. Hypnotism for Reducing Pain A study was conducted to investigate the effectivenessof hypnotism in reducing pain. Results for randomly selected subjects are given in the accompanyingtable (based on An Analysis of Factors That Contribute to the Efficacy of HypnoticAnalgesia, by Price and Barber, Journal of Abnormal Psychology, Vol. 96, No. 1). The valuesare before and after hypnosis; the measurements are in centimeters on a pain scale. Construct a95% confidence interval for the mean of the before/after differences. Does hypnotismappear to be effective in reducing pain? Subject A B C D E F G HBefore 6.6 6.5 9.0 10.3 11.3 8.1 6.3 11.6After 6.8 2.4 7.4 8.5 8.1 6.1 3.4 2.0
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