Smokers may have a more difficult time quitting smoking if they live with another smoker. How can an experiment explore this possibility in a study to compare bupropion with placebo? Suppose the researchers split the subjects into two groups: those who live with another smoker, and those who do not live with smokers. Within each group, the subjects are randomly assigned to take bupropion or a placebo. The figure shows a flow chart of this design, when 250 of the 429 study subjects live with nonsmokers and 179 live with another smoker.
a. Is this design a completely randomized design? Why or why not?
b. Does this experiment have blocks? If so, identify them.
c. Is this design a randomized block design? Explain why or why not.

  • CreatedSeptember 11, 2015
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