1.Identify the sample that is described.

Officials at a metropolitan transit authority want to get input from people who use a certain bus route about a possible change in the schedule. They randomly select5

buses during a certain week and poll all riders on those buses about the change.

2.Randomized experiment or observational study? Do you think it is possible to design a randomized experiment to study this question, or will an observational study be necessary? A scientist wants to know whether people who live very close to airports have more hearing loss than people who live away from airports.