Discuss the following:
Q: To determine the possible effect of a chemical treatment on the rate of seed germination, 300 chemically treated seeds and 250 untreated seeds were sown. It was found that 267 of the chemically treated seeds and 205 of the untreated seeds germinated. Let P1 be the proportion of the population of all chemically treated seeds that germinate, and let P2 be the proportion of the population of all untreated seeds that germinate. 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 level of the 90% confidence interval?