A sample consists of 25 freshmen, 25 sophomores, 25 juniors, and 25 seniors from a local high school that has an equal number of students in each class. If the sample was obtained using a list of all the students in the high school, it is probably an example of ____ sampling. If the sample was obtained without a list of students, it is likely an example of ____ sampling.

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The first scenario describes stratified random sampling because the sample includes equal numbers from identifiable subgroups (freshmen, sophomores, juniors, seniors), ensuring representation from each group. The second scenario suggests quota sampling, a non-probability sampling technique where the selection is made to reflect certain characteristics of the population, in this case, class year, but without using a list for random selection.

A Sample Consists of 25 Freshmen, 25 Sophomores, 25 Juniors