Question
A study was conducted to measure the effectiveness of hypnotism in reducing pain. The measurements are...
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 that the 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?
|
Before |
8.4 |
7.8 |
8.4 |
9.0 |
12.3 |
6.9 |
5.9 |
2.4 |
|
|---|---|---|---|---|---|---|---|---|---|
|
After |
6.6 |
2.9 |
7.9 |
8.3 |
8.8 |
6.5 |
3.4 |
2.3 |
Construct a 95% confidence interval for the mean of the "before−after" differences.
doe hypnotism appear to be effective in reducing pain?
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