Question

What type of sampling is this:

Group the students in a local college by year and then randomly select 15 students from each group.

Answer 1

This kind of sampling is called the Cluster sampling. The cluster sampling method is done by dividing the population by groups called clusters. There will be an equal number of samples drawn from each cluster using simple random sampling. In here, the population are the students which are divided into clusters - by year level. 15 students will be selected from each cluster.