A librarian wants to gather data on the number of times books of fiction are checked out during the year. The library has 2000 books of fiction, of which 500 are murder mysteries, 400 are science fiction, and the rest are "other". She decides to sample 120 books. Suppose the librarian decides to take a simple random sample of 30 books from the murder mystery category, 24 from the science fiction category, and the remaining 66 from the other category. What sampling technique was used?
A) simple random
B) cluster
C) stratified
D) multi-stage

Question

Quizplus · Accepted Answer

The librarian used stratified sampling because she divided the books into distinct categories (strata) - murder mysteries, science fiction, and others - and then took a sample from each category.

A Librarian Wants to Gather Data on the Number of Times