The proportion of subjects randomly assigned to take St. John's wort is 0.334 which is about one-third of the total subjects who took part in the study.
Total Number of subjects :
(27 + 27 + 37 + 16 + 26 + 13 + 70 + 56 + 66) = 338
Number of subjects randomly assigned to take St. John's wort:
(27 + 16 + 70) = 113
The proportion of subjects assigned to take St. John's wort :
Number subjects assigned / total subjects :
113 / 338 = 0.334
The research study embarked upon in the scenario described is an experimental study which involves testing treatments on the subjects to monitor their response to each treatment.
The number of treatment condition used in the study is three namely : St. John's wort, Zoloft and a Placebo.
When assigning subjects to treatment, it is best that each treatment is assigned equal number of subjects in other to avoid bias.
To achieve this, then 1/3 of the total subjects should be assigned to each treatment condition.
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