A placebo is a fake and inert substance, procedure, or treatment that has no known direct effects.
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Q443: In a double-blind study, neither the researcher
Q444: Random assignment means that all participants in
Q445: The placebo effect is also called the
Q446: Extraneous variables are also called confounding variables.
Q447: The control group (or control condition) is
Q449: A single-blind technique is one in which
Q450: In a double-blind experiment, participants are both
Q451: Participants in the control group receive none
Q452: The purpose of the double-blind technique is
Q453: Any change in performance that results from
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