Exercise1:
When a therapeutic drug A was administered to 100 patients with a certain disease, 40 patients showed symptomatic improvement. When a therapeutic drug B was administered to other 90 patients, 20 patients showed symptomatic improvement. Analyze whether drug efficacies of these 2 drugs are statistically different.
Exercise 2:
When a therapeutic drug A was administered to 3000 patients with a certain disease, 20 patients died. When a therapeutic drug B was administered to other 500 patients with the same disease, 15 patients died. Analyze whether mortality rates are different between 2 drugs.
