"To be considered eligible for the study, subjects had to be older than 21 years of age, hold a valid state driver's license, and be able to fire a shotgun." This is an example of which of the following?
a. Inclusion plan
b. Population element
c. Sampling criteria
d. Representativeness
ANS: C
Sampling criteria, also referred to as eligibility criteria or inclusion criteria, include a list of characteristics essential for membership or eligibility in the target population. The criteria are developed from the research problem, the purpose, a review of literature, the conceptual and operational definitions of the study variables, and the design. The sampling criteria determine the target population, and the sample is selected from the accessible population within the target population
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