# Estimate and Sample Sizes

I. In a study designed to test the effectiveness of acupuncture for treating migraine headaches 36 subjects were treated with acupuncture and 25 subjects were given a sham treatment. The number of migraine attacks for the acupuncture group had a mean of 2.609 and a sample deviation of 1.8.

Construct a 95% confidence interval for the mean number of migraine attacks for those subjects treated with acupuncture. You may use StatCrunch for making calculations.

a. What is the point estimate for the mean number of migraine attacks for those subjects treated with acupuncture?

b. What is the appropriate distribution (z or t)?

c. Show equation with filled in numerical values.

d. What is the Confidence Interval?

https://brainmass.com/statistics/confidence-interval/estimate-sample-sizes-528866

#### Solution Preview

Problem: In a study designed to test the effectiveness of acupuncture for treating migraine headaches 36 subjects were treated with acupuncture and 25 subjects were given a sham treatment. The number of migraine attacks for the acupuncture group had a mean of 2.609 and a sample deviation of 1.8. ...

#### Solution Summary

The expert examines estimates and sample sizes. The appropriate distributions are examined.