A placebo is identical in appearance to the treatment of interest, but contains no active ingredients.
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Q8: A study is an observational study if
Q9: A control group provides a baseline for
Q10: Stratified sampling is a sampling method that
Q11: Selection bias can occur if volunteers only
Q12: Random subpopulations of a population are called
Q14: Random assignment of volunteers should result in
Q15: By definition, a simple random sample of
Q16: Response bias can occur when responses are
Q17: Two factors are extraneous if their effects
Q18: If the subjects as well as the
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