Five Hundred Persons Were Chosen to Participate in a Study

Five hundred persons were chosen to participate in a study, 270 women and 230 men, representative of the proportion of adult women and men in the population of Portland, Oregon. Patients were selected using a table of random numbers, from a master list of all patients who had been treated for congestive heart failure (CHF) in the previous 3 months at one of Portland's four main hospitals. This is an example of what type of sampling strategy?

A) Simple random sampling
B) Convenience sampling
C) Purposive sampling
D) Stratified random sampling

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