When recruiting a sample of individuals to participate in a

When recruiting a sample of individuals to participate in a study on reaction time, researchers used the most recent census to identify local older adults, who were

between the ages of 60 and 65, between 65 and 70, between 70 and 75, between 75 and

80, and between 80 and 85. Once they had identified these subgroups, the researchers randomly selected 20 people from within each age group to participate in the study. What kind of sampling method did the researchers use?

a. convenience sampling

b. random sampling

c. stratified sampling

d. cluster sampling

Solution

d. cluster sampling