A study was conducted to measure the effectiveness of hypnot

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 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? The 95% confidence interval for the mean of the before after differences can be found using technology or manually with the formulas presented above. For the purposes of this exercise, use technology. Input the data into technology and read the limits of the confidence interval from the Output.

Solution

Answer: (-0.67, 3.50)

7.1500	mean Before
5.7375	mean After
1.4125	mean difference (Before - After)
2.4925	std. dev.
0.8812	std. error
8	n
7	df