20 people who come from a specific selection of classroom. Researchers who conducted experiments by asapda posted on 5 days per 20 minutes per day, including a trial period of 8 weeks.
20 of which have come from the select sampling of one classroom, the research is conducted manually. By commuting into the five days a week, 20 minutes per day for a total period of 8 weeks.
20 people, which is derived from the random number 1 classroom research is operated manually by the experimental test ลงอ 5 days a week A 20 minutes total time in the experiment 8 week.