Question

# A pharmaceutical company interested in measuring how often physicians prescribe a certain drug has selected a...

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. (Doctors of Osteopathic). What is this type of sampling called?
Simple random sampling.
Stratified random sampling.
None of the above.

In simple random sampling, we sample our data from the entire population. Here the effects of the subpopulations in a population are not considered.

In stratified random sampling, we sample our data from the individual subpopulations(partitions of a population) of an entire population. Sampling in this way helps in determining the effect of subpopulations.

In the above problem, they had sampled from two groups of a population(M.D and D.O). Hence such type of sampling is called stratified random sampling.

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