Answer: cluster sampling
Step-by-step explanation:
- A cluster sampling technique is a kind of random sampling technique in statistics , where the researcher splits the entire population into a finite number of distinct classes called as clusters.
- The he randomly select a sample of clusters from them such that all the participant of the cluster are involved in the study .
Given : Christine samples the population by splitting the residents by towns and randomly selecting 9 of the towns.
Since she collects data from all the residents in the selected towns.
That means , towns are the clusters.
Hence, the type of sampling is used : "cluster sampling"
