Example: A sample of 20 students from a college is selected if you know that the number of students is this The college has 1000 students. The number of students of the first stage (400), the number of students of the second stage (300) the number of The third stage students (200) the number of the fourth stage students (100) based on that, the sample is required. Example: A sample of 20 students from a college is selected if you know that the number of students is this The college has 1000 students. The number of students of the first stage (400), the number of students of the second stage (300) the number of The third stage students (200) the number of the fourth stage students (100) based on that, the sample is required