Why are broad sampling criteria preferable for descriptive nursing studies? (Select all that apply.)
a. The accessible population is often limited in size.
b. They include the sample that is the most representative of the population at that site.
c. Broad sampling criteria are preferable for studies conducted in natural settings.
d. Broad sampling criteria eliminate more extraneous variables than do narrow sampling criteria.
e. Generalization is improved with broad sampling criteria.
ANS: A, B, C, E
Broad sampling criteria ensure a large target population of heterogeneous or diverse potential subjects. A heterogeneous sample increases one's ability to generalize the findings to a larger target population. In descriptive or correlational studies, the sampling criteria may be defined to ensure a heterogeneous population with a broad range of values for the variables being studied. Descriptive studies are usually conducted with minimal control of the study design, because subjects are examined as they exist in their natural setting, such as home, work, or school.
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