Does St John's Wort Have a Significant Effect in Treating Major

question 39

Multiple Choice

Does St. John's wort have a significant effect in treating major depression? A study looked at 340 adult outpatients suffering from major depression as measured by their HAM-D score, randomly assigning each subject to either a placebo, St. John's wort, or a second active treatment for comparison.
Why is this study an experiment? Because:

• A) the researchers were comparing outcomes from three groups.
• B) there is a response variable.
• C) there was a placebo.
• D) the researchers assigned treatments to the subjects.

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