controlled experiment

noun
an experiment or trial that uses controls, usually separating the subjects into one or more control groups and experimental groups.
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Main Entry:  controlled experiment
Part of Speech:  n
Definition:  a trial or experiment that includes a control (comparison) group; also called controlled study; any trial or test of a hypothesis under carefully managed conditions
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Example sentences
Maybe my life is some sort of controlled experiment.
It was also the only controlled experiment that imposed a specific change of
  environment and watched what happened.
But the question has not been investigated in detail, partly due to the
  difficulty of designing a controlled experiment.
It should be noted that this is not a controlled experiment, but rather a case
  study of two bears in one zoo.
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