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...




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


9.3


6.8


6.9


10.3


7.3


9.2


3.5


1.1




After


6.5


2.1


7.4


8.5


8.8


6.6


3.3


2.8






Construct a​ 95% confidence interval for the mean of the
​"before−​after"

differences.





<>


​(Round to two decimal places as​ needed.)



Jun 10, 2022
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