Students are selected at random from lists of students at a university organized by class level such that the proportion of individuals at each class level in the population of students matches the proportion selected for the sample. This type of sampling is ______.
A) simple random sample
B) stratified random sample
C) haphazard/volunteer sample
D) cluster sample

Question

Quizplus · Accepted Answer

This is an example of a stratified random sample, where the population is divided into groups (in this case, class levels) and individuals are randomly selected from each group to ensure that the sample reflects the proportion of individuals in each group in the population.

Students Are Selected at Random from Lists of Students at a University