I don't know if this is right, but I'm pretty sure it's B.
This isn’t an answer but we gotta see the question to answer it ☠️☠️
Answer:
It is called the constant ratio.
……….. I’m sorry need points
Answer:
a. is effective for use in school research.
Step-by-step explanation:
Cluster sampling is the sampling whereby we pick random few sample from the population to serve as the sample population called cluster. This cluster usually have uniform characteristics among them.
The main advantage of cluster sampling is that it is effective school research because of its cheapness and doesn't require much resources during the sampling process.
The other options are not correct because Cluster sampling have High sampling error and its biased sample.