A simple random sample of 75 people are given a new drug that is designed to relieve pain. After taking this drug for a month, they switch to a standard drug. The question of interest is whether the proportion of people who experienced relief is greater when taking the new drug. To address this question, which of the following is the most appropriate type of hypothesis test?

i. A test for the difference between two population means using independent samples ii. A test for the difference between two population proportions iii. A test for the difference between two population means using matched pairs iv. A test for the difference between two population standard deviations