The cluster sampling technique can be defined as dividing the population into clusters and from each cluster all individuals are interviewed.
We are selecting five statistics classes at random at college and then interviewing all the students from each five class and this situation leads to cluster sampling technique. Here the population all the classes of college is divided into five clusters that are five statistics classes and then all students are interviewed from each class.
Cluster sampling is any sampling procedure that the statistics can be divided into a finite
number of distinct and identifiable units, the most of groups or clusters in the statistics will correctly represent the total students that are interviewed in the class.
because 15/100 can be reduced if you divide by 5 which will be 3/20. After you multiply 3/20 by 20/1. So 20*3 is 60 divided by 20 because 20*1 equals 20 you get 3.
