Use of placebos and shams allows you to establish how much of a treatment's effectiveness is caused by simply receiving treatment.
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Q21: Effectiveness is the clinical term for internal
Q22: Because clinical trials focus on studying treatments
Q23: When a study uses no blinding or
Q24: Ancillary questions are addressed by the no
Q25: The placebo arm is the clinical trial
Q27: A disadvantage of simple randomization is that
Q28: One of the disadvantages of using stratified
Q29: The advantage of using the group allocation
Q30: Population selection is critical to the internal
Q31: Intent-to-treat is when a researcher analyzes only
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