How Can a Nurse Researcher Know That a Research Study

How can a nurse researcher know that a research study has external validity?

A) External validity refers to the relationship existing between the independent variable and study outcomes.
B) External validity refers to the influence of a specific event on the dependent variable.
C) External validity refers to the degree to which extraneous or mediating variables interfered with the study outcomes.
D) External validity refers to the degree to which findings are generalizable to populations beyond those studied.

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