Response bias can occur when responses are not actually obtained from all individuals selected for inclusion in the sample.
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Q11: Selection bias can occur if volunteers only
Q12: Random subpopulations of a population are called
Q13: A placebo is identical in appearance to
Q14: Random assignment of volunteers should result in
Q15: By definition, a simple random sample of
Q17: Two factors are extraneous if their effects
Q18: If the subjects as well as the
Q19: The method of control wherein an extraneous
Q20: Replicating in an experiment means that the
Q21: A friend of yours, who is not
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