Discussion:
In a comparative study of two new drugs, A and B, 300 patients were treated with drug A, and 200 patients were treated with drug B. (The two treatment groups were randomly and independently chosen.) It was found that 204 patients were cured using drug A and patients were cured using drug B. Let P1 be the proportion of the population of all patients who are cured using drug A, and let P2 be the proportion of the population of all patients who are cured using drug B. Find a 90% confidence interval for P1-P2. Then complete the table below.
1. What is the lower limit of the 90% confidence interval?
2. What is the upper limit of the 90% confidence interval?