A researcher contacts seven large hospitals and makes arrangements to recruit 55 patients from each of their emergency rooms. If this is cluster sampling, how were the seven large hospitals chosen?
a. By size
b. By random selection
c. By availability
d. By researcher familiarity
ANS: B
In cluster sampling, a sampling frame is developed that includes a list of all the states, cities, institutions, or organizations with which elements of the identified population would be linked. States, cities, institutions, or organizations are selected randomly as units from which to obtain elements for the sample. In some cases, random selection continues through several stages and is then referred to as multistage cluster sampling.
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