A nurse researcher opts to use a stratified sample in a research study for which reason?
a. The sample population is divided into subsets that are homogeneous for a particular trait or feature.
b. The sample population is divided into subsets for random assignment into an intervention or a usual-care group.
c. The sample population is randomly assigned to a specific subgroup that will vary from the others on the basis of type of treatment.
d. The sample population is randomly assigned to a specific subgroup that will vary from the others on the basis of treatment duration.
ANS: A
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A The major characteristic of a stratified sample is that selected subjects represent population subgroups that are homogeneous.
B A stratified sample would have representation in both the treatment and control groups.
C In a stratified sample, both treatment and control groups have representative groups.
D Stratified samples are not devised on the basis of length of treatment but on proportions of subjects in the population.
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