For which of these reasons would a nurse researcher choose to assign subjects randomly to groups in a study?
a. To help ensure that all groups within a study are representative of the larger population
b. To increase the chance that the study groups will be different from each other with regard to extraneous variables
c. To help ensure that current events do not influence the outcomes of the study
d. To eliminate the need for establishing specific study criteria and subject eligibility
ANS: A
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A The purpose of randomization is to help ensure that subjects in the study's groups represent the larger population.
B Randomization helps to ensure that study groups will be approximately equal, not different with regard to extraneous variables.
C Randomization cannot control current historical events.
D Randomization does not eliminate the need for study criteria and subject eligibility factors.
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