Shows that in the study used a sample of the entire group, and a group of 36 people per group, but the comparison in the study may actually be falling, survey, or lost during the trial. Therefore, the sample size has been increased by the rate of fall has brought the rate of loss from the survey or tracking (Drop out) to increase the size of the sample in the study is expected to fall 10 percent surveyed manufacturers, using the formula:
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