Which action would increase the control of an experimental study?
a. Establishing strict criteria for subject selection
b. Allowing participants to decide whether or not to be in the experimental group
c. Ensuring that subjects do not know the purpose of the experimental study
d. Increasing the number of assistants involved in data collection
ANS: A
Feedback
A Strict subject selection criteria help to minimize bias and limit extraneous variables.
B Self-selection for the treatment group would be likely to decrease control, increase bias, and limit the validity of study outcomes.
C Subjects are entitled to know the purpose of a study via informed consent.
D Increasing the number of research assistants to collect data can decrease control if they are not specially trained.
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