A pharmaceutical company interested in measuring how often physicians prescribe a certain drug has selected a simple random sample from each of two groups: M.D. (Medical Doctors) and D.O. (Osteopaths). What is this type of sampling called?
A. Simple random sampling.
B. Cluster sampling.
C. Stratified random sampling.
D. None of these choices.
Analysis:
A. Incorrect. This type of sampling is called stratified random sampling.
B. Incorrect. This type of sampling is called stratified random sampling.
C. Correct. This type of sampling is called stratified random sampling.
D. Incorrect. This type of sampling is called stratified random sampling.
ANSWER : C
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