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 5.5 1.5 10.5 9.3 8.2 5.5 4.6 5.8 After 6.1 2.4 7.8 8.8 8.9 6.8 3.4 2.1 Construct a 95% confidence interval for the mean of the "before - after" differences. < Ha < (Round to two decimal places as needed.) Does hypnotism appear to be effective in reducing pain? O A. No, because the confidence interval does not include and is entirely greater than zero. B. Yes, because the confidence interval includes zero. O C. No, because the confidence interval includes zero. D. Yes, because the confidence interval does not include and is entirely greater than zero.