Sample size calculation. Researchers used the results of the chutha-WONG, 17, and treasure, use the formula to calculate the sample size, two independent groups of dawn and make the wind 85 77 18 sum simple examples (Simple Random Sampling) and an adjustment to increase the size of the sample used in this study was funded by another 20 percent comes from the results of the research study involved a rolling average of 20 19 percent loss, 've samples number of 100 people is divided into groups of 50 people, control group trial of 50 people.
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