A. **Two-sample procedure**: This scenario involves comparing two distinct groups (students who live on campus and students who live off campus) regarding their rates of absenteeism. Since there are two separate samples and the interest is in comparing the differences between these groups, a two-sample test is appropriate. B. **Two-sample procedure**: Here, we have pairs of employees from the same department, one of whom listens to music and the other does not, while performing the same task. This setup calls for a two-sample test to compare the two different conditions (listening to music vs. not listening) on the same task across matched pairs. C. **Two-sample procedure**: This case involves two groups of customers receiving different treatments (different brands of coffee) and the measurement of a specific outcome (number of refills ordered). Even though the groups are tested simultaneously in the same location, it's a comparison between two distinct treatments, necessitating a two-sample test. D. **Two-sample procedure**: Although this involves only one individual (you), the comparison is between two different travel methods (bus vs. ride from a friend). The data collected on different days under different conditions (bus or ride) effectively form two separate groups, making a two-sample test suitable for