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Which is an example of a controlled experiment?
  • a subject who is not getting treatment
  • a study where investigators decide who will be in a treatment group and who will not
  • a study in which the subjects assign themselves to different groups
  • a study on the effects of smoking
  • a process outside the control of the investigators
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    Carlos Rodriguez <>
    This problem was contributed by a student in Elementary Statistics. It is offered as it is with no warranty of any kind
    Last modified: Wed May 13 12:29:11 EDT 1998