Mathematics, 20.12.2019 22:31, FlyToTheGalaxy

Students in a college statistics class want to conduct a survey to determine the percentage of students in the school who are willing to pay a fee for participating in extracurricular activities. thirty students are randomly selected to complete the survey from each of the freshman, sophomore, junior, and senior classes. this plan is an example of which type of sampling?
o convenience sampling
o stratified sampling
o simple random sampling
o a cluster sampling

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