How would a nurse researcher ensure that the sample used in a quantitative study is homogeneous?
a. Use eligibility criteria to limit extraneous variables relevant to the study.
b. Randomly assign subjects to either the experimental or the control group.
c. Assign one research assistant to collect data from all subjects.
d. Collect data from all subjects at the same time of day.
ANS: A
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A Homogeneity of a sample is ensured by restricting eligibility criteria.
B Random assignment to experimental or control groups helps avoid bias but does not ensure homogeneity of the sample.
C Data collection by one researcher helps ensure consistency in data collection but does not ensure a homogenous sample.
D Uniform timing of data collection helps ensure consistency of data collection but does not ensure a homogeneous sample.
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