Investigators Recently Reported the Results a Study Designed to Assess

Essay

Investigators recently reported the results a study designed to assess whether or not the herb, St. John's Wort is effective in treating moderately severe cases of depression. The study involved 338 subjects, randomly assigned to receive one of three treatments: St. John's Wort , Zoloft, or a placebo. The authors were primarily interested in whether St. John's Wort performed better than placebo and included Zoloft as a "way to measure how sensitive the trial was to detecting antidepressant effects." Their results are presented in the table below. ​
a)What is the probability that a randomly selected subject had no response?
b)What is the probability that a randomly selected subject was treated with Zoloft and had a full response?
c)What is the probability that a randomly selected subject had a full or partial response given that they were treated with St. John's Wort?
d)What is the probability that a randomly selected subject that didn't have a full response was treated with Placebo?