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# In a study designed to test the effectiveness of acupuncture for treating migraine, 142 subjects were treated with acupuncture and 80 subjects were...

In a study designed to test the effectiveness of acupuncture for treating migraine, 142 subjects were treated with acupuncture and 80 subjects were given a sham treatment. The numbers of migraine attacks for 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.

- A. Construct a 97% confidence interval estimate of the mean number of migraine attacks for

those treated with acupuncture.

B. Interpret this interval in the context of this problem.

C. How many subjects treated with acupuncture need to be sampled to keep the error of the

estimate within __+__ .4 of the population mean?