Why Should a Nurse Researcher Attempt to Clearly Specify Exclusion

Why should a nurse researcher attempt to clearly specify exclusion criteria for a study sample?

A) To limit the time needed to complete the study
B) To reduce the effect of extraneous variables on the accurate evaluation of the outcome variable
C) To eliminate the outside influences and inferences regarding the effectiveness of a behavioral intervention
D) To ensure that an adequate sample size is accrued to meet assumptions for accurate statistical analysis

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