A sample of research consists of Student Edition for the year and model year 2538 (1995) 2537 (1994) students both male and female students and student groups, groups of young people who have come to the end of 248 from a sampling class.
The research sample of students in the years 2537 and 2538 model year students, both men and women. Group lessons and group classes brilliantly soft totaled 248, which came from a stratified random sample.