SOLUTION: An instructor is interested in the average weekly study time for his students. He teaches two sections in Spring and randomly chooses 15 students from the first section and 18 stu

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Question 1047448: An instructor is interested in the average weekly study time for his students. He teaches two sections in Spring and randomly chooses 15 students from the first section and 18 students from the second section. This sampling method is called
cluster
convenience
stratified
systematic
I'm leaning towards this being a cluster because the other methods don't seem to fit in. Any clarification on this would be greatly appreciated! Thank you!
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Stratified

Cluster is used when the number of subgroupings of the population is big that you do the random sampling on the subgroups themselves,
and after selection, do a random sample on each subgroup.