Why should a nurse researcher want to limit or eliminate extraneous variables in a study?
a. More research questions would be required to account for the extraneous variables.
b. Extensive statistical analysis would be required to justify the presence of extraneous variables.
c. Extraneous variables compete with the independent variables as explanations of the study's outcome.
d. Manipulation of the extraneous variables increases the risk for researcher bias in the study's outcomes.
ANS: C
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A Research questions are not necessarily linked to or controlling of extraneous variables.
B Statistical analysis cannot justify the presence of extraneous variables, although it may be able to estimate the magnitude of their effect.
C Extraneous or mediating variables interfere with analyzing the effect of the independent variables on the dependent variable.
D Manipulation of extraneous variables does not necessarily increase (or decrease) the risk for researcher bias.
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