Question

1. A pharmaceutical trial tests the effectiveness of 3 different drugs (A, B, and C) for relieving arthritis symptoms. 30% of the participants in the trial are given drug A. Of those, 70% experience relief from their symptoms (event R). 32% of participants are given drug B, of which 80% experience relief. The remaining 38% of participants are given drug C, of these 53% experience relief.

a. What’s the probability that a participant did not experience relief if they took drug B?

b. What’s the probability that a participant experienced relief given that they did not take drug C?

c. What is the probability that a participant in the trial gets relief from their symptoms?

d. If a participant experience relief, what is the probability that they took drug C?

e. If a participant did not experience relief from their symptoms, what is the probability that they took drug A?

Answer 1