Acupuncture for Migraines In a study designed to test the effectiveness of acupuncture for treating migraine headaches, 142 subjects were treated with acupuncture and 80 subjects were given a sham treatment. The numbers of migraine attacks for the acupuncture treatment group had a mean of 1.8 and a standard deviation of 1.4. The numbers of migraine attacks for the sham treatment group had a mean of 1.6 and a standard deviation of 1.2. Construct a 95%

confidence interval estimate of s for each of the two groups, and then compare the results.