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 minus−​after" differences.

Does hypnotism appear to be effective in reducing​ pain?

Before 5.6, 2.5, 10.0, 7.9, 7.9, 6.8, 3.2, 6.5

After 6.5, 2.8, 7.3, 8.3, 8.1, 6.5, 3.3, 2.4

Homework Answers

Answer #1
Number Before After Difference
5.6 6.5 -0.9 2.4025
2.5 2.8 -0.3 0.9025
10 7.3 2.7 4.2025
7.9 8.3 -0.4 1.1025
7.9 8.1 -0.2 0.7225
6.8 6.5 0.3 0.1225
3.2 3.3 -0.1 0.5625
6.5 2.4 4.1 11.9025
Total 50.4 45.2 5.2 21.92



Confidence Interval :-



Lower Limit =
Lower Limit = -0.8298
Upper Limit =
Upper Limit = 2.1298
95% Confidence interval is ( -0.8298 , 2.1298 )

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