A study is an observational study if the investigator observes the behavior of a response variable when one or more factors are manipulated.
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Q3: A treatment is any particular combination of
Q4: As long as the sample size is
Q5: Increasing sample size will generally eliminate bias
Q6: Clusters are non-overlapping subgroups of a population
Q7: Blocking is a technique that can be
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
Q13: A placebo is identical in appearance to
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