What action by a nurse researcher will help eliminate bias on the ...

[sheilaspns]

What action by a nurse researcher will help eliminate bias on the dependent variable?
 
  a. Establishing strict eligibility criteria for the study participants
  b. Ensuring that all data are collected by a single researcher
  c. Formulating at least two hypotheses for each research question
  d. Developing a strong theoretical framework for the study

Question 2

A nurse researcher is investigating the effect of type of operating room mattress and surgical position on tissue interface pressures in healthy young adults. Which component of research is most affected by the choice of subjects?
 
  a. Mortality
  b. Instrumentation
  c. Internal validity
  d. External validity

[pikon]

Answer to Question 1

ANS: A

Feedback
A Strict eligibility criteria help reduce extraneous or mediating variables that compete with the study (independent) variables for impact on the dependent variable.
B Collection of data by a single researcher would provide constancy in data collection but would not control bias if poor sampling techniques were used.
C Formulating two hypotheses would not eliminate bias.
D Testing of a theoretical framework does not by itself control bias.

Answer to Question 2

ANS: D

Feedback
A Attrition of subjects (mortality) would not be affected by the choice of subjects.
B Instrumentation to measure interface pressures would not be affected by the choice of subjects.
C Internal validity would not be affected by the choice of subjects.
D Subject selection affects external validity (generalizability), especially because most surgical patients are not healthy young adults.

[sheilaspns]

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[pikon]

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