Researchers wanted to compare the effectiveness and safety of an extract of St. Johns wort with placebo
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(a) What type of experimental design is this?
(b) What is the population that is being studied?
(c) What is the response variable in this study?
(d) What are the treatments?
(e) Identify the experimental units.
(f ) What is the control group in this study?
(g) Draw a diagram similar to Figure 7 or 8 to illustrate the design.
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