At a college there are 120 freshmen, 90 sophomores, 110 juniors, and 80 seniors. A school administrator selects a simple random sample of 12 of the freshmen, a simple random sample of 9 Of the sophomores, a simple random sample of 11 of the juniors, and a simple random sample of 8 Of the seniors. She then interviews all the students selected. Identify the type of sampling used in This example.

Question

Quizplus · Accepted Answer

The sampling method used is stratified sampling because the population is divided into different subgroups (freshmen, sophomores, juniors, seniors) and a random sample is taken from each subgroup.

At a College There Are 120 Freshmen, 90 Sophomores, 110