estimate the probability that a subject was in the drug group, or had symptom relief, or both (the union). (b) estimate the probability that a subject who was in the drug group had symptom relief. (c) estimate the probability that a subject who was in the placebo group had symptom relief. (d) estimate the probability that a subject had symptom relief overall, regardless of group. (e) how much higher was the estimated probability of symptom relief in the drug group vs. the p