A Researcher Is Interested in Surveying Physicians from a Local

Multiple Choice

A researcher is interested in surveying physicians from a local medical society to examine their continuing education needs. He decides that she will draw a sample that contains physicians from a variety of different subspecialties. He divides the list of the population up by specialty, and then he randomly selects the number of physicians within each specialty in proportion to their percentage in the population. What is this type of sampling?

A) Simple random
B) Systematic
C) Stratified random
D) One-stage cluster