Question

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.

Answer 1

Answer:

The type of sampling used in the example is 'stratified sampling'.

Explanation:

• The term 'stratified' used to name the method of sampling is referred to as 'fixed' or definite.
• If we keenly process the data that is given in the example, we can find that the number of students chosen for the study from each category makes up 10 percent of the entire category.
• As the researcher has chosen to carry out the study with a definite 10 percent of students from each category, the sampling method can be concluded to be 'stratified sampling'.