Which action will the researcher take to improve construct validity?
a. Allow data collectors to know which subjects are assigned to which groups
b. Ensure that operational definitions reflect theoretical constructs
c. Make sure that the researcher is involved in data collection
d. Utilize only one measurement method to measure study variables
Question 2
A researcher wishes to conduct a study of a small number of subjects on a large hospital intensive care unit. To minimize problems associated with extraneous variables in the study setting, the researcher will
a. ensure double-blind data collection methods.
b. randomly assign subjects to treatment and control groups.
c. test the reliability of study measures.
d. train a small number of nurses to administer the intervention.
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