Question

A study was conducted to measure the effectiveness of hypnotism in reducing pain. The measurements are centimeters on a pain scale before and after Hipnosis. Assume that the paired sample data are simple random samples and that the difference is 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: 9.7, 6.1, 10.7, 11.2, 12.5, 10.5, 4.9, 2.0

after: 6.5, 2.5, 7.3, 8.8, 8.8, 6.7, 3.1, 2.2

construct a 95% confidence interval for the mean of the “before – after“ differences.

___ <ud< ___ (round to two decimal places as needed)

Answer 1